812305231 has 2 divisors, whose sum is σ = 812305232. Its totient is φ = 812305230.

The previous prime is 812305229. The next prime is 812305261. The reversal of 812305231 is 132503218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812305231 - 2¹ = 812305229 is a prime.

It is a super-2 number, since 2×812305231² = 1319679576619926722, which contains 22 as substring.

Together with 812305229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 812305196 and 812305205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812305261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406152615 + 406152616.

It is an arithmetic number, because the mean of its divisors is an integer number (406152616).

Almost surely, 2^812305231 is an apocalyptic number.

812305231 is a deficient number, since it is larger than the sum of its proper divisors (1).

812305231 is an equidigital number, since it uses as much as digits as its factorization.

812305231 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 25.

The square root of 812305231 is about 28500.9689484410. The cubic root of 812305231 is about 933.0532214543.

Adding to 812305231 its reverse (132503218), we get a palindrome (944808449).

The spelling of 812305231 in words is "eight hundred twelve million, three hundred five thousand, two hundred thirty-one".