2131597 has 6 divisors (see below), whose sum is σ = 2308362. Its totient is φ = 1967472.

The previous prime is 2131573. The next prime is 2131601. The reversal of 2131597 is 7951312.

It can be written as a sum of positive squares in 3 ways, for example, as 2916 + 2128681 = 54^2 + 1459^2 .

It is not a de Polignac number, because 2131597 - 2⁷ = 2131469 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 (2131517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6138 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (384727).

2^2131597 is an apocalyptic number.

It is an amenable number.

2131597 is a deficient number, since it is larger than the sum of its proper divisors (176765).

2131597 is a wasteful number, since it uses less digits than its factorization.

2131597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12639 (or 12626 counting only the distinct ones).

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

The square root of 2131597 is about 1459.9989726024. The cubic root of 2131597 is about 128.6969832303.

It can be divided in two parts, 21315 and 97, that added together give a palindrome (21412).

The spelling of 2131597 in words is "two million, one hundred thirty-one thousand, five hundred ninety-seven".