815131097 has 4 divisors (see below), whose sum is σ = 889233936. Its totient is φ = 741028260.

The previous prime is 815131073. The next prime is 815131129. The reversal of 815131097 is 790131518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 815131097 - 2⁶ = 815131033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815131697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37051403 + ... + 37051424.

It is an arithmetic number, because the mean of its divisors is an integer number (222308484).

Almost surely, 2^815131097 is an apocalyptic number.

It is an amenable number.

815131097 is a deficient number, since it is larger than the sum of its proper divisors (74102839).

815131097 is a wasteful number, since it uses less digits than its factorization.

815131097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74102838.

The product of its (nonzero) digits is 7560, while the sum is 35.

The square root of 815131097 is about 28550.5008187247. The cubic root of 815131097 is about 934.1339448292.

The spelling of 815131097 in words is "eight hundred fifteen million, one hundred thirty-one thousand, ninety-seven".