813491361 has 72 divisors (see below), whose sum is σ = 1310325120. Its totient is φ = 485761536.

The previous prime is 813491359. The next prime is 813491387. The reversal of 813491361 is 163194318.

It is not a de Polignac number, because 813491361 - 2¹ = 813491359 is a prime.

Its product of digits (15552) is a multiple of the sum of its prime divisors (243).

It is not an unprimeable number, because it can be changed into a prime (813491321) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7602670 + ... + 7602776.

It is an arithmetic number, because the mean of its divisors is an integer number (18198960).

Almost surely, 2^813491361 is an apocalyptic number.

It is an amenable number.

813491361 is a deficient number, since it is larger than the sum of its proper divisors (496833759).

813491361 is a wasteful number, since it uses less digits than its factorization.

813491361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 243 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 813491361 is about 28521.7699485849. The cubic root of 813491361 is about 933.5071494165.

The spelling of 813491361 in words is "eight hundred thirteen million, four hundred ninety-one thousand, three hundred sixty-one".