812227631 has 2 divisors, whose sum is σ = 812227632. Its totient is φ = 812227630.

The previous prime is 812227613. The next prime is 812227643. The reversal of 812227631 is 136722218.

812227631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (812227613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812227631 is a prime.

It is a super-2 number, since 2×812227631² = 1319427449119744322, which contains 22 as substring.

It is equal to p_41742644 and since 812227631 and 41742644 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812227531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406113815 + 406113816.

It is an arithmetic number, because the mean of its divisors is an integer number (406113816).

Almost surely, 2^812227631 is an apocalyptic number.

812227631 is a deficient number, since it is larger than the sum of its proper divisors (1).

812227631 is an equidigital number, since it uses as much as digits as its factorization.

812227631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 812227631 is about 28499.6075587016. The cubic root of 812227631 is about 933.0235087991.

Adding to 812227631 its reverse (136722218), we get a palindrome (948949849).

It can be divided in two parts, 8122 and 27631, that added together give a palindrome (35753).

The spelling of 812227631 in words is "eight hundred twelve million, two hundred twenty-seven thousand, six hundred thirty-one".