117815213 has 2 divisors, whose sum is σ = 117815214. Its totient is φ = 117815212.

The previous prime is 117815207. The next prime is 117815231. The reversal of 117815213 is 312518711.

Together with next prime (117815231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115197289 + 2617924 = 10733^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 117815213 - 2²⁴ = 101037997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117815273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58907606 + 58907607.

It is an arithmetic number, because the mean of its divisors is an integer number (58907607).

Almost surely, 2^117815213 is an apocalyptic number.

It is an amenable number.

117815213 is a deficient number, since it is larger than the sum of its proper divisors (1).

117815213 is an equidigital number, since it uses as much as digits as its factorization.

117815213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 29.

The square root of 117815213 is about 10854.2716476049. The cubic root of 117815213 is about 490.2306466567.

The spelling of 117815213 in words is "one hundred seventeen million, eight hundred fifteen thousand, two hundred thirteen".