117631813 has 4 divisors (see below), whose sum is σ = 126680428. Its totient is φ = 108583200.

The previous prime is 117631807. The next prime is 117631837. The reversal of 117631813 is 318136711.

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 36505764 + 81126049 = 6042^2 + 9007^2 .

It is a cyclic number.

It is not a de Polignac number, because 117631813 - 2⁹ = 117631301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117631873) 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, 4524288 + ... + 4524313.

It is an arithmetic number, because the mean of its divisors is an integer number (31670107).

Almost surely, 2^117631813 is an apocalyptic number.

117631813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

117631813 is a deficient number, since it is larger than the sum of its proper divisors (9048615).

117631813 is an equidigital number, since it uses as much as digits as its factorization.

117631813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048614.

The product of its digits is 3024, while the sum is 31.

The square root of 117631813 is about 10845.8200704234. The cubic root of 117631813 is about 489.9761379467.

The spelling of 117631813 in words is "one hundred seventeen million, six hundred thirty-one thousand, eight hundred thirteen".