113121987 has 16 divisors (see below), whose sum is σ = 168989952. Its totient is φ = 66705120.

The previous prime is 113121979. The next prime is 113122001. The reversal of 113121987 is 789121311.

It is not a de Polignac number, because 113121987 - 2³ = 113121979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (113121907) 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, 45103 + ... + 47544.

It is an arithmetic number, because the mean of its divisors is an integer number (10561872).

Almost surely, 2^113121987 is an apocalyptic number.

113121987 is a deficient number, since it is larger than the sum of its proper divisors (55867965).

113121987 is a wasteful number, since it uses less digits than its factorization.

113121987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92698.

The product of its digits is 3024, while the sum is 33.

The square root of 113121987 is about 10635.8820508691. The cubic root of 113121987 is about 483.6327197344.

The spelling of 113121987 in words is "one hundred thirteen million, one hundred twenty-one thousand, nine hundred eighty-seven".