1812856313 has 2 divisors, whose sum is σ = 1812856314. Its totient is φ = 1812856312.

The previous prime is 1812856271. The next prime is 1812856327. The reversal of 1812856313 is 3136582181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500167824 + 312688489 = 38732^2 + 17683^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812856313 - 2⁸ = 1812856057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1812859313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906428156 + 906428157.

It is an arithmetic number, because the mean of its divisors is an integer number (906428157).

Almost surely, 2^1812856313 is an apocalyptic number.

It is an amenable number.

1812856313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812856313 is an equidigital number, since it uses as much as digits as its factorization.

1812856313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 1812856313 is about 42577.6503931347. The cubic root of 1812856313 is about 1219.3296310394.

The spelling of 1812856313 in words is "one billion, eight hundred twelve million, eight hundred fifty-six thousand, three hundred thirteen".