2531491121 has 2 divisors, whose sum is σ = 2531491122. Its totient is φ = 2531491120.

The previous prime is 2531491051. The next prime is 2531491133. The reversal of 2531491121 is 1211941352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2327001121 + 204490000 = 48239^2 + 14300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531491121 - 2²² = 2527296817 is a prime.

It is not a weakly prime, because it can be changed into another prime (2531490121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265745560 + 1265745561.

It is an arithmetic number, because the mean of its divisors is an integer number (1265745561).

Almost surely, 2^2531491121 is an apocalyptic number.

It is an amenable number.

2531491121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531491121 is an equidigital number, since it uses as much as digits as its factorization.

2531491121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 2531491121 is about 50313.9257164455. The cubic root of 2531491121 is about 1362.8837169227.

The spelling of 2531491121 in words is "two billion, five hundred thirty-one million, four hundred ninety-one thousand, one hundred twenty-one".