117520813 has 4 divisors (see below), whose sum is σ = 124433820. Its totient is φ = 110607808.

The previous prime is 117520787. The next prime is 117520817. The reversal of 117520813 is 318025711.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66797929 + 50722884 = 8173^2 + 7122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117520813 is a prime.

It is a super-2 number, since 2×117520813² = 27622282976361938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117520817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3456478 + ... + 3456511.

It is an arithmetic number, because the mean of its divisors is an integer number (31108455).

Almost surely, 2^117520813 is an apocalyptic number.

It is an amenable number.

117520813 is a deficient number, since it is larger than the sum of its proper divisors (6913007).

117520813 is an equidigital number, since it uses as much as digits as its factorization.

117520813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6913006.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 117520813 is about 10840.7016839317. The cubic root of 117520813 is about 489.8219719776.

The spelling of 117520813 in words is "one hundred seventeen million, five hundred twenty thousand, eight hundred thirteen".