501211631 has 2 divisors, whose sum is σ = 501211632. Its totient is φ = 501211630.

The previous prime is 501211603. The next prime is 501211673. The reversal of 501211631 is 136112105.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 501211631 - 2⁶ = 501211567 is a prime.

It is a super-2 number, since 2×501211631² = 502426198099360322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501211691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250605815 + 250605816.

It is an arithmetic number, because the mean of its divisors is an integer number (250605816).

Almost surely, 2^501211631 is an apocalyptic number.

501211631 is a deficient number, since it is larger than the sum of its proper divisors (1).

501211631 is an equidigital number, since it uses as much as digits as its factorization.

501211631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 501211631 is about 22387.7562743567. The cubic root of 501211631 is about 794.3411235918.

Adding to 501211631 its reverse (136112105), we get a palindrome (637323736).

The spelling of 501211631 in words is "five hundred one million, two hundred eleven thousand, six hundred thirty-one".