2531831 has 2 divisors, whose sum is σ = 2531832. Its totient is φ = 2531830.

The previous prime is 2531821. The next prime is 2531833. The reversal of 2531831 is 1381352.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2531831 is a prime.

It is a super-2 number, since 2×2531831² = 12820336425122, which contains 22 as substring.

Together with 2531833, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2531797 and 2531806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265915 + 1265916.

It is an arithmetic number, because the mean of its divisors is an integer number (1265916).

2^2531831 is an apocalyptic number.

2531831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531831 is an equidigital number, since it uses as much as digits as its factorization.

2531831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 2531831 is about 1591.1728378778. The cubic root of 2531831 is about 136.2944707962.

The spelling of 2531831 in words is "two million, five hundred thirty-one thousand, eight hundred thirty-one".