815391361 has 8 divisors (see below), whose sum is σ = 824886720. Its totient is φ = 805951248.

The previous prime is 815391329. The next prime is 815391371. The reversal of 815391361 is 163193518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 815391361 - 2⁵ = 815391329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815391361.

It is not an unprimeable number, because it can be changed into a prime (815391301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16255 + ... + 43531.

It is an arithmetic number, because the mean of its divisors is an integer number (103110840).

Almost surely, 2^815391361 is an apocalyptic number.

It is an amenable number.

815391361 is a deficient number, since it is larger than the sum of its proper divisors (9495359).

815391361 is a wasteful number, since it uses less digits than its factorization.

815391361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27623.

The product of its digits is 19440, while the sum is 37.

The square root of 815391361 is about 28555.0584135281. The cubic root of 815391361 is about 934.2333544281.

The spelling of 815391361 in words is "eight hundred fifteen million, three hundred ninety-one thousand, three hundred sixty-one".