51622431 has 24 divisors (see below), whose sum is σ = 81051264. Its totient is φ = 29136240.

The previous prime is 51622427. The next prime is 51622433. The reversal of 51622431 is 13422615.

It is not a de Polignac number, because 51622431 - 2² = 51622427 is a prime.

It is a super-2 number, since 2×51622431² = 5329750764699522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51622433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10086 + ... + 14316.

It is an arithmetic number, because the mean of its divisors is an integer number (3377136).

Almost surely, 2^51622431 is an apocalyptic number.

51622431 is a deficient number, since it is larger than the sum of its proper divisors (29428833).

51622431 is a wasteful number, since it uses less digits than its factorization.

51622431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331 (or 4324 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 51622431 is about 7184.8751554916. The cubic root of 51622431 is about 372.3455354045.

The spelling of 51622431 in words is "fifty-one million, six hundred twenty-two thousand, four hundred thirty-one".