815307099 has 32 divisors (see below), whose sum is σ = 1180784640. Its totient is φ = 499219200.

The previous prime is 815307089. The next prime is 815307113. The reversal of 815307099 is 990703518.

It is a happy number.

It is not a de Polignac number, because 815307099 - 2⁵ = 815307067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815307099.

It is not an unprimeable number, because it can be changed into a prime (815307049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138192 + ... + 143970.

It is an arithmetic number, because the mean of its divisors is an integer number (36899520).

Almost surely, 2^815307099 is an apocalyptic number.

815307099 is a deficient number, since it is larger than the sum of its proper divisors (365477541).

815307099 is a wasteful number, since it uses less digits than its factorization.

815307099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5891.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 815307099 is about 28553.5829450526. The cubic root of 815307099 is about 934.2011723020.

The spelling of 815307099 in words is "eight hundred fifteen million, three hundred seven thousand, ninety-nine".