51345931 has 16 divisors (see below), whose sum is σ = 63370944. Its totient is φ = 40512384.

The previous prime is 51345907. The next prime is 51345941. The reversal of 51345931 is 13954315.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51345931 - 2⁷ = 51345803 is a prime.

It is a super-2 number, since 2×51345931² = 5272809260513522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51345893 and 51345902.

It is not an unprimeable number, because it can be changed into a prime (51345941) 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, 50181 + ... + 51193.

It is an arithmetic number, because the mean of its divisors is an integer number (3960684).

Almost surely, 2^51345931 is an apocalyptic number.

51345931 is a deficient number, since it is larger than the sum of its proper divisors (12025013).

51345931 is a wasteful number, since it uses less digits than its factorization.

51345931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590.

The product of its digits is 8100, while the sum is 31.

The square root of 51345931 is about 7165.6075108814. The cubic root of 51345931 is about 371.6795593893.

The spelling of 51345931 in words is "fifty-one million, three hundred forty-five thousand, nine hundred thirty-one".