51438931 has 2 divisors, whose sum is σ = 51438932. Its totient is φ = 51438930.

The previous prime is 51438911. The next prime is 51438941. The reversal of 51438931 is 13983415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51438931 - 2⁵ = 51438899 is a prime.

It is a super-2 number, since 2×51438931² = 5291927244845522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51438911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25719465 + 25719466.

It is an arithmetic number, because the mean of its divisors is an integer number (25719466).

Almost surely, 2^51438931 is an apocalyptic number.

51438931 is a deficient number, since it is larger than the sum of its proper divisors (1).

51438931 is an equidigital number, since it uses as much as digits as its factorization.

51438931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 51438931 is about 7172.0939062452. The cubic root of 51438931 is about 371.9038248118.

The spelling of 51438931 in words is "fifty-one million, four hundred thirty-eight thousand, nine hundred thirty-one".