2531657 has 4 divisors (see below), whose sum is σ = 2680596. Its totient is φ = 2382720.

The previous prime is 2531653. The next prime is 2531663. The reversal of 2531657 is 7561352.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1692601 + 839056 = 1301^2 + 916^2 .

It is not a de Polignac number, because 2531657 - 2² = 2531653 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2531653) 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, 74444 + ... + 74477.

It is an arithmetic number, because the mean of its divisors is an integer number (670149).

2^2531657 is an apocalyptic number.

It is an amenable number.

2531657 is a deficient number, since it is larger than the sum of its proper divisors (148939).

2531657 is a wasteful number, since it uses less digits than its factorization.

2531657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148938.

The product of its digits is 6300, while the sum is 29.

The square root of 2531657 is about 1591.1181602885. The cubic root of 2531657 is about 136.2913484471.

The spelling of 2531657 in words is "two million, five hundred thirty-one thousand, six hundred fifty-seven".