51604957 has 4 divisors (see below), whose sum is σ = 52106080. Its totient is φ = 51103836.

The previous prime is 51604951. The next prime is 51604997. The reversal of 51604957 is 75940615.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51604957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51604951) 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, 250407 + ... + 250612.

It is an arithmetic number, because the mean of its divisors is an integer number (13026520).

Almost surely, 2^51604957 is an apocalyptic number.

It is an amenable number.

51604957 is a deficient number, since it is larger than the sum of its proper divisors (501123).

51604957 is a wasteful number, since it uses less digits than its factorization.

51604957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501122.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 51604957 is about 7183.6590258725. The cubic root of 51604957 is about 372.3035181391.

The spelling of 51604957 in words is "fifty-one million, six hundred four thousand, nine hundred fifty-seven".