Search a number
1608069689 = 7187223747
BaseRepresentation
bin101111111011001…
…0011001000111001
311011001212101220122
41133312103020321
511243131212224
6423322303025
754564236552
oct13766231071
94131771818
101608069689
11755793616
1238a657a75
131c81ccb35
141137d5329
159629515e
hex5fd93239

1608069689 has 4 divisors (see below), whose sum is σ = 1608300624. Its totient is φ = 1607838756.

The previous prime is 1608069647. The next prime is 1608069719. The reversal of 1608069689 is 9869608061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9869608061 = 67147307583.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1608069689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1608069689.

It is not an unprimeable number, because it can be changed into a prime (1608069289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104687 + ... + 119060.

It is an arithmetic number, because the mean of its divisors is an integer number (402075156).

Almost surely, 21608069689 is an apocalyptic number.

It is an amenable number.

1608069689 is a deficient number, since it is larger than the sum of its proper divisors (230935).

1608069689 is an equidigital number, since it uses as much as digits as its factorization.

1608069689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230934.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 1608069689 is about 40100.7442449638. The cubic root of 1608069689 is about 1171.5701249065.

The spelling of 1608069689 in words is "one billion, six hundred eight million, sixty-nine thousand, six hundred eighty-nine".

Divisors: 1 7187 223747 1608069689