815192031 has 4 divisors (see below), whose sum is σ = 1086922712. Its totient is φ = 543461352.

The previous prime is 815192003. The next prime is 815192039. The reversal of 815192031 is 130291518.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 815192031 - 2⁵ = 815191999 is a prime.

It is a super-2 number, since 2×815192031² = 1329076094811809922, which contains 22 as substring.

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 815192031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815192039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135865336 + ... + 135865341.

It is an arithmetic number, because the mean of its divisors is an integer number (271730678).

Almost surely, 2^815192031 is an apocalyptic number.

815192031 is a deficient number, since it is larger than the sum of its proper divisors (271730681).

815192031 is a wasteful number, since it uses less digits than its factorization.

815192031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271730680.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 815192031 is about 28551.5679254222. The cubic root of 815192031 is about 934.1572208804.

The spelling of 815192031 in words is "eight hundred fifteen million, one hundred ninety-two thousand, thirty-one".