117813731 has 4 divisors (see below), whose sum is σ = 134644272. Its totient is φ = 100983192.

The previous prime is 117813721. The next prime is 117813739. The reversal of 117813731 is 137318711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137318711 = 67 ⋅2049533.

It is a cyclic number.

It is not a de Polignac number, because 117813731 - 2⁶ = 117813667 is a prime.

It is a super-2 number, since 2×117813731² = 27760150424280722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117813739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8415260 + ... + 8415273.

It is an arithmetic number, because the mean of its divisors is an integer number (33661068).

Almost surely, 2^117813731 is an apocalyptic number.

117813731 is a deficient number, since it is larger than the sum of its proper divisors (16830541).

117813731 is an equidigital number, since it uses as much as digits as its factorization.

117813731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16830540.

The product of its digits is 3528, while the sum is 32.

The square root of 117813731 is about 10854.2033793365. The cubic root of 117813731 is about 490.2285911076.

The spelling of 117813731 in words is "one hundred seventeen million, eight hundred thirteen thousand, seven hundred thirty-one".