51604979 has 4 divisors (see below), whose sum is σ = 54640584. Its totient is φ = 48569376.

The previous prime is 51604951. The next prime is 51604997. The reversal of 51604979 is 97940615.

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 51604979 - 2¹⁶ = 51539443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51604909) 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, 1517777 + ... + 1517810.

It is an arithmetic number, because the mean of its divisors is an integer number (13660146).

Almost surely, 2^51604979 is an apocalyptic number.

51604979 is a deficient number, since it is larger than the sum of its proper divisors (3035605).

51604979 is a wasteful number, since it uses less digits than its factorization.

51604979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3035604.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 51604979 is about 7183.6605571255. The cubic root of 51604979 is about 372.3035710454.

The spelling of 51604979 in words is "fifty-one million, six hundred four thousand, nine hundred seventy-nine".