815225923 has 4 divisors (see below), whose sum is σ = 815797840. Its totient is φ = 814654008.

The previous prime is 815225911. The next prime is 815225953. The reversal of 815225923 is 329522518.

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

It is a cyclic number.

It is not a de Polignac number, because 815225923 - 2⁵ = 815225891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815225903) 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, 283815 + ... + 286672.

It is an arithmetic number, because the mean of its divisors is an integer number (203949460).

Almost surely, 2^815225923 is an apocalyptic number.

815225923 is a deficient number, since it is larger than the sum of its proper divisors (571917).

815225923 is a wasteful number, since it uses less digits than its factorization.

815225923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571916.

The product of its digits is 43200, while the sum is 37.

The square root of 815225923 is about 28552.1614418243. The cubic root of 815225923 is about 934.1701667127.

The spelling of 815225923 in words is "eight hundred fifteen million, two hundred twenty-five thousand, nine hundred twenty-three".