117981523 has 16 divisors (see below), whose sum is σ = 131420160. Its totient is φ = 105019200.

The previous prime is 117981511. The next prime is 117981529. The reversal of 117981523 is 325189711.

It is not a de Polignac number, because 117981523 - 2¹⁷ = 117850451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117981529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118558 + ... + 119548.

It is an arithmetic number, because the mean of its divisors is an integer number (8213760).

Almost surely, 2^117981523 is an apocalyptic number.

117981523 is a deficient number, since it is larger than the sum of its proper divisors (13438637).

117981523 is a wasteful number, since it uses less digits than its factorization.

117981523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its digits is 15120, while the sum is 37.

The square root of 117981523 is about 10861.9299850441. The cubic root of 117981523 is about 490.4612108984.

The spelling of 117981523 in words is "one hundred seventeen million, nine hundred eighty-one thousand, five hundred twenty-three".