812562997541 has 2 divisors, whose sum is σ = 812562997542. Its totient is φ = 812562997540.

The previous prime is 812562997459. The next prime is 812562997567. The reversal of 812562997541 is 145799265218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493851940516 + 318711057025 = 702746^2 + 564545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812562997541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812562994541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406281498770 + 406281498771.

It is an arithmetic number, because the mean of its divisors is an integer number (406281498771).

Almost surely, 2^812562997541 is an apocalyptic number.

It is an amenable number.

812562997541 is a deficient number, since it is larger than the sum of its proper divisors (1).

812562997541 is an equidigital number, since it uses as much as digits as its factorization.

812562997541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 59.

The spelling of 812562997541 in words is "eight hundred twelve billion, five hundred sixty-two million, nine hundred ninety-seven thousand, five hundred forty-one".