501438131 has 2 divisors, whose sum is σ = 501438132. Its totient is φ = 501438130.

The previous prime is 501438127. The next prime is 501438151. The reversal of 501438131 is 131834105.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 501438131 - 2² = 501438127 is a prime.

It is a super-2 number, since 2×501438131² = 502880398441546322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 501438131.

It is not a weakly prime, because it can be changed into another prime (501438151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250719065 + 250719066.

It is an arithmetic number, because the mean of its divisors is an integer number (250719066).

Almost surely, 2^501438131 is an apocalyptic number.

501438131 is a deficient number, since it is larger than the sum of its proper divisors (1).

501438131 is an equidigital number, since it uses as much as digits as its factorization.

501438131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 501438131 is about 22392.8142715470. The cubic root of 501438131 is about 794.4607611249.

The spelling of 501438131 in words is "five hundred one million, four hundred thirty-eight thousand, one hundred thirty-one".