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61000019 = 131465649
BaseRepresentation
bin1110100010110…
…0100101010011
311020210010021222
43220230211103
5111104000034
610015235255
71340330423
oct350544523
9136703258
1061000019
1131484243
1218518b2b
13c83a1b2
14815c483
15554e12e
hex3a2c953

61000019 has 4 divisors (see below), whose sum is σ = 61465800. Its totient is φ = 60534240.

The previous prime is 61000003. The next prime is 61000039. The reversal of 61000019 is 91000016.

61000019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61000019 - 24 = 61000003 is a prime.

It is a super-2 number, since 2×610000192 = 7442004636000722, which contains 22 as substring.

61000019 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 60999970 and 61000006.

It is not an unprimeable number, because it can be changed into a prime (61000039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232694 + ... + 232955.

It is an arithmetic number, because the mean of its divisors is an integer number (15366450).

Almost surely, 261000019 is an apocalyptic number.

61000019 is a deficient number, since it is larger than the sum of its proper divisors (465781).

61000019 is a wasteful number, since it uses less digits than its factorization.

61000019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465780.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 61000019 is about 7810.2508922569. The cubic root of 61000019 is about 393.6497591809.

The spelling of 61000019 in words is "sixty-one million, nineteen", and thus it is an aban number and an uban number.

Divisors: 1 131 465649 61000019