51238631 has 2 divisors, whose sum is σ = 51238632. Its totient is φ = 51238630.

The previous prime is 51238619. The next prime is 51238633. The reversal of 51238631 is 13683215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51238631 - 2¹⁴ = 51222247 is a prime.

It is a super-2 number, since 2×51238631² = 5250794613508322, which contains 22 as substring.

Together with 51238633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51238594 and 51238603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51238633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25619315 + 25619316.

It is an arithmetic number, because the mean of its divisors is an integer number (25619316).

Almost surely, 2^51238631 is an apocalyptic number.

51238631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51238631 is an equidigital number, since it uses as much as digits as its factorization.

51238631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 51238631 is about 7158.1164421934. The cubic root of 51238631 is about 371.4204734287.

The spelling of 51238631 in words is "fifty-one million, two hundred thirty-eight thousand, six hundred thirty-one".