2531123939 has 4 divisors (see below), whose sum is σ = 2531629320. Its totient is φ = 2530618560.

The previous prime is 2531123911. The next prime is 2531123953. The reversal of 2531123939 is 9393211352.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2531123939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2531723939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245102 + ... + 255219.

It is an arithmetic number, because the mean of its divisors is an integer number (632907330).

Almost surely, 2^2531123939 is an apocalyptic number.

2531123939 is a deficient number, since it is larger than the sum of its proper divisors (505381).

2531123939 is an equidigital number, since it uses as much as digits as its factorization.

2531123939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505380.

The product of its digits is 43740, while the sum is 38.

The square root of 2531123939 is about 50310.2766738566. The cubic root of 2531123939 is about 1362.8178202447.

The spelling of 2531123939 in words is "two billion, five hundred thirty-one million, one hundred twenty-three thousand, nine hundred thirty-nine".