51904831 has 4 divisors (see below), whose sum is σ = 56623464. Its totient is φ = 47186200.

The previous prime is 51904829. The next prime is 51904843. The reversal of 51904831 is 13840915.

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 51904831 - 2¹ = 51904829 is a prime.

It is a super-2 number, since 2×51904831² = 5388222962277122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51904793 and 51904802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51905831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2359300 + ... + 2359321.

It is an arithmetic number, because the mean of its divisors is an integer number (14155866).

Almost surely, 2^51904831 is an apocalyptic number.

51904831 is a deficient number, since it is larger than the sum of its proper divisors (4718633).

51904831 is a wasteful number, since it uses less digits than its factorization.

51904831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718632.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51904831 is about 7204.5007460615. The cubic root of 51904831 is about 373.0232719130.

The spelling of 51904831 in words is "fifty-one million, nine hundred four thousand, eight hundred thirty-one".