2531991243 has 16 divisors (see below), whose sum is σ = 3558464000. Its totient is φ = 1596996000.

The previous prime is 2531991229. The next prime is 2531991263. The reversal of 2531991243 is 3421991352.

It is not a de Polignac number, because 2531991243 - 2⁹ = 2531990731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2531991263) 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 15 ways as a sum of consecutive naturals, for example, 13233 + ... + 72381.

It is an arithmetic number, because the mean of its divisors is an integer number (222404000).

Almost surely, 2^2531991243 is an apocalyptic number.

2531991243 is a deficient number, since it is larger than the sum of its proper divisors (1026472757).

2531991243 is a wasteful number, since it uses less digits than its factorization.

2531991243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59922.

The product of its digits is 58320, while the sum is 39.

The square root of 2531991243 is about 50318.8954866857. The cubic root of 2531991243 is about 1362.9734615589.

The spelling of 2531991243 in words is "two billion, five hundred thirty-one million, nine hundred ninety-one thousand, two hundred forty-three".