2113931 has 2 divisors, whose sum is σ = 2113932. Its totient is φ = 2113930.

The previous prime is 2113913. The next prime is 2113939. The reversal of 2113931 is 1393112.

Together with previous prime (2113913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2113931 is a prime.

It is a super-2 number, since 2×2113931² = 8937408545522, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2113939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056965 + 1056966.

It is an arithmetic number, because the mean of its divisors is an integer number (1056966).

2^2113931 is an apocalyptic number.

2113931 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113931 is an equidigital number, since it uses as much as digits as its factorization.

2113931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 20.

The square root of 2113931 is about 1453.9363810016. The cubic root of 2113931 is about 128.3404632384.

The spelling of 2113931 in words is "two million, one hundred thirteen thousand, nine hundred thirty-one".