2115931 has 4 divisors (see below), whose sum is σ = 2207952. Its totient is φ = 2023912.

The previous prime is 2115923. The next prime is 2115937. The reversal of 2115931 is 1395112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2115931 - 2³ = 2115923 is a prime.

It is a super-2 number, since 2×2115931² = 8954327993522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115937) 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, 45976 + ... + 46021.

It is an arithmetic number, because the mean of its divisors is an integer number (551988).

2^2115931 is an apocalyptic number.

2115931 is a deficient number, since it is larger than the sum of its proper divisors (92021).

2115931 is an equidigital number, since it uses as much as digits as its factorization.

2115931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92020.

The product of its digits is 270, while the sum is 22.

The square root of 2115931 is about 1454.6240064017. The cubic root of 2115931 is about 128.3809249847.

The spelling of 2115931 in words is "two million, one hundred fifteen thousand, nine hundred thirty-one".