113907921 has 4 divisors (see below), whose sum is σ = 151877232. Its totient is φ = 75938612.

The previous prime is 113907917. The next prime is 113907929. The reversal of 113907921 is 129709311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129709311 = 3 ⋅43236437.

It is a cyclic number.

It is not a de Polignac number, because 113907921 - 2² = 113907917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (113907929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18984651 + ... + 18984656.

It is an arithmetic number, because the mean of its divisors is an integer number (37969308).

Almost surely, 2^113907921 is an apocalyptic number.

It is an amenable number.

113907921 is a deficient number, since it is larger than the sum of its proper divisors (37969311).

113907921 is an equidigital number, since it uses as much as digits as its factorization.

113907921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37969310.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 113907921 is about 10672.7653867215. The cubic root of 113907921 is about 484.7501756557.

The spelling of 113907921 in words is "one hundred thirteen million, nine hundred seven thousand, nine hundred twenty-one".