811123631 has 2 divisors, whose sum is σ = 811123632. Its totient is φ = 811123630.

The previous prime is 811123619. The next prime is 811123633. The reversal of 811123631 is 136321118.

811123631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 811123631 - 2¹⁸ = 810861487 is a prime.

It is a super-2 number, since 2×811123631² = 1315843089533248322, which contains 22 as substring.

Together with 811123633, it forms a pair of twin primes.

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 811123631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811123633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405561815 + 405561816.

It is an arithmetic number, because the mean of its divisors is an integer number (405561816).

Almost surely, 2^811123631 is an apocalyptic number.

811123631 is a deficient number, since it is larger than the sum of its proper divisors (1).

811123631 is an equidigital number, since it uses as much as digits as its factorization.

811123631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 811123631 is about 28480.2322848673. The cubic root of 811123631 is about 932.6005875389.

Adding to 811123631 its reverse (136321118), we get a palindrome (947444749).

The spelling of 811123631 in words is "eight hundred eleven million, one hundred twenty-three thousand, six hundred thirty-one".