2531591 has 4 divisors (see below), whose sum is σ = 2534784. Its totient is φ = 2528400.

The previous prime is 2531569. The next prime is 2531593. The reversal of 2531591 is 1951352.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2531591 - 2⁶ = 2531527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2531591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531593) 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, 611 + ... + 2331.

It is an arithmetic number, because the mean of its divisors is an integer number (633696).

2^2531591 is an apocalyptic number.

2531591 is a deficient number, since it is larger than the sum of its proper divisors (3193).

2531591 is a wasteful number, since it uses less digits than its factorization.

2531591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192.

The product of its digits is 1350, while the sum is 26.

The square root of 2531591 is about 1591.0974200218. The cubic root of 2531591 is about 136.2901640703.

The spelling of 2531591 in words is "two million, five hundred thirty-one thousand, five hundred ninety-one".