2131957 has 4 divisors (see below), whose sum is σ = 2140096. Its totient is φ = 2123820.

The previous prime is 2131951. The next prime is 2131979. The reversal of 2131957 is 7591312.

2131957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3663 + ... + 4204.

It is an arithmetic number, because the mean of its divisors is an integer number (535024).

2^2131957 is an apocalyptic number.

It is an amenable number.

2131957 is a deficient number, since it is larger than the sum of its proper divisors (8139).

2131957 is an equidigital number, since it uses as much as digits as its factorization.

2131957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8138.

The product of its digits is 1890, while the sum is 28.

The square root of 2131957 is about 1460.1222551554. The cubic root of 2131957 is about 128.7042279246.

The spelling of 2131957 in words is "two million, one hundred thirty-one thousand, nine hundred fifty-seven".