117561531 has 8 divisors (see below), whose sum is σ = 164998720. Its totient is φ = 74249352.

The previous prime is 117561497. The next prime is 117561539. The reversal of 117561531 is 135165711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 117561531 - 2¹⁷ = 117430459 is a prime.

It is a super-2 number, since 2×117561531² = 27641427142127922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117561539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031185 + ... + 1031298.

It is an arithmetic number, because the mean of its divisors is an integer number (20624840).

Almost surely, 2^117561531 is an apocalyptic number.

117561531 is a deficient number, since it is larger than the sum of its proper divisors (47437189).

117561531 is a wasteful number, since it uses less digits than its factorization.

117561531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062505.

The product of its digits is 3150, while the sum is 30.

The square root of 117561531 is about 10842.5795362543. The cubic root of 117561531 is about 489.8785357685.

The spelling of 117561531 in words is "one hundred seventeen million, five hundred sixty-one thousand, five hundred thirty-one".