50391631 has 2 divisors, whose sum is σ = 50391632. Its totient is φ = 50391630.

The previous prime is 50391623. The next prime is 50391703. The reversal of 50391631 is 13619305.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 50391631 - 2³ = 50391623 is a prime.

It is a super-2 number, since 2×50391631² = 5078632949680322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 50391631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50391031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25195815 + 25195816.

It is an arithmetic number, because the mean of its divisors is an integer number (25195816).

Almost surely, 2^50391631 is an apocalyptic number.

50391631 is a deficient number, since it is larger than the sum of its proper divisors (1).

50391631 is an equidigital number, since it uses as much as digits as its factorization.

50391631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 50391631 is about 7098.7062905856. The cubic root of 50391631 is about 369.3625034161.

It can be divided in two parts, 5039 and 1631, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 50391631 in words is "fifty million, three hundred ninety-one thousand, six hundred thirty-one".