113963991 has 16 divisors (see below), whose sum is σ = 153880800. Its totient is φ = 75018240.

The previous prime is 113963989. The next prime is 113963999. The reversal of 113963991 is 199369311.

It is not a de Polignac number, because 113963991 - 2¹ = 113963989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113963999) 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, 85611 + ... + 86931.

It is an arithmetic number, because the mean of its divisors is an integer number (9617550).

Almost surely, 2^113963991 is an apocalyptic number.

113963991 is a deficient number, since it is larger than the sum of its proper divisors (39916809).

113963991 is a wasteful number, since it uses less digits than its factorization.

113963991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666.

The product of its digits is 39366, while the sum is 42.

The square root of 113963991 is about 10675.3918429255. The cubic root of 113963991 is about 484.8297003678.

The spelling of 113963991 in words is "one hundred thirteen million, nine hundred sixty-three thousand, nine hundred ninety-one".