113509591 has 20 divisors (see below), whose sum is σ = 130958072. Its totient is φ = 97781904.

The previous prime is 113509589. The next prime is 113509597. The reversal of 113509591 is 195905311.

It is not a de Polignac number, because 113509591 - 2¹ = 113509589 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 (113509597) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1694140 + ... + 1694206.

Almost surely, 2^113509591 is an apocalyptic number.

113509591 is a deficient number, since it is larger than the sum of its proper divisors (17448481).

113509591 is an frugal number, since it uses more digits than its factorization.

113509591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 6075, while the sum is 34.

The square root of 113509591 is about 10654.0879947558. The cubic root of 113509591 is about 484.1844671142.

The spelling of 113509591 in words is "one hundred thirteen million, five hundred nine thousand, five hundred ninety-one".