2531991244 has 24 divisors (see below), whose sum is σ = 4541368608. Its totient is φ = 1234488960.

The previous prime is 2531991229. The next prime is 2531991263. The reversal of 2531991244 is 4421991352.

It is a junction number, because it is equal to n+sod(n) for n = 2531991197 and 2531991206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629889 + ... + 633895.

It is an arithmetic number, because the mean of its divisors is an integer number (189223692).

Almost surely, 2^2531991244 is an apocalyptic number.

It is an amenable number.

2531991244 is a deficient number, since it is larger than the sum of its proper divisors (2009377364).

2531991244 is a wasteful number, since it uses less digits than its factorization.

2531991244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7905 (or 7903 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 2531991244 is about 50318.8954966223. The cubic root of 2531991244 is about 1362.9734617383.

The spelling of 2531991244 in words is "two billion, five hundred thirty-one million, nine hundred ninety-one thousand, two hundred forty-four".