813297562394 has 32 divisors (see below), whose sum is σ = 1293100771536. Its totient is φ = 382315847680.

The previous prime is 813297562381. The next prime is 813297562403. The reversal of 813297562394 is 493265792318.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 395383152025 + 417914410369 = 628795^2 + 646463^2 .

It is a super-2 number, since 2×813297562394² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191768114 + ... + 191772354.

Almost surely, 2^813297562394 is an apocalyptic number.

813297562394 is a deficient number, since it is larger than the sum of its proper divisors (479803209142).

813297562394 is a wasteful number, since it uses less digits than its factorization.

813297562394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010.

The product of its digits is 19595520, while the sum is 59.

The spelling of 813297562394 in words is "eight hundred thirteen billion, two hundred ninety-seven million, five hundred sixty-two thousand, three hundred ninety-four".