115815213 has 12 divisors (see below), whose sum is σ = 168009660. Its totient is φ = 76877376.

The previous prime is 115815209. The next prime is 115815221. The reversal of 115815213 is 312518511.

It can be written as a sum of positive squares in 2 ways, for example, as 83119689 + 32695524 = 9117^2 + 5718^2 .

It is not a de Polignac number, because 115815213 - 2² = 115815209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115815233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25518 + ... + 29711.

It is an arithmetic number, because the mean of its divisors is an integer number (14000805).

Almost surely, 2^115815213 is an apocalyptic number.

It is an amenable number.

115815213 is a deficient number, since it is larger than the sum of its proper divisors (52194447).

115815213 is a wasteful number, since it uses less digits than its factorization.

115815213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55468 (or 55465 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 115815213 is about 10761.7476740537. The cubic root of 115815213 is about 487.4407912312.

The spelling of 115815213 in words is "one hundred fifteen million, eight hundred fifteen thousand, two hundred thirteen".