51601913 has 16 divisors (see below), whose sum is σ = 58335552. Its totient is φ = 45240000.

The previous prime is 51601889. The next prime is 51601981. The reversal of 51601913 is 31910615.

It is a cyclic number.

It is not a de Polignac number, because 51601913 - 2¹² = 51597817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51601313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34838 + ... + 36288.

It is an arithmetic number, because the mean of its divisors is an integer number (3645972).

Almost surely, 2^51601913 is an apocalyptic number.

51601913 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

51601913 is a deficient number, since it is larger than the sum of its proper divisors (6733639).

51601913 is a wasteful number, since it uses less digits than its factorization.

51601913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 51601913 is about 7183.4471530039. The cubic root of 51601913 is about 372.2961976912.

The spelling of 51601913 in words is "fifty-one million, six hundred one thousand, nine hundred thirteen".