Search a number
-
+
1988000569 = 445872
BaseRepresentation
bin111011001111110…
…0111101100111001
312010112202220002201
41312133213230321
513032412004234
6525133430201
7100156504012
oct16637475471
95115686081
101988000569
119301a1285
1247593b361
13258b356c9
1414c054009
15b97e2314
hex767e7b39

1988000569 has 3 divisors (see below), whose sum is σ = 1988045157. Its totient is φ = 1987955982.

The previous prime is 1988000557. The next prime is 1988000593. The reversal of 1988000569 is 9650008891.

The square root of 1988000569 is 44587.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9650008891 = 26935873639.

It is not a de Polignac number, because 1988000569 - 25 = 1988000537 is a prime.

It is a super-2 number, since 2×19880005692 = 7904292524688647522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988000549) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22294 + ... + 66880.

It is an arithmetic number, because the mean of its divisors is an integer number (662681719).

Almost surely, 21988000569 is an apocalyptic number.

1988000569 is the 44587-th square number.

1988000569 is the 22294-th centered octagonal number.

It is an amenable number.

1988000569 is a deficient number, since it is larger than the sum of its proper divisors (44588).

1988000569 is an frugal number, since it uses more digits than its factorization.

1988000569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89174 (or 44587 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 46.

The cubic root of 1988000569 is about 1257.3962712073.

The spelling of 1988000569 in words is "one billion, nine hundred eighty-eight million, five hundred sixty-nine", and thus it is an aban number.

Divisors: 1 44587 1988000569