2531523181991 has 2 divisors, whose sum is σ = 2531523181992. Its totient is φ = 2531523181990.

The previous prime is 2531523181931. The next prime is 2531523182051. The reversal of 2531523181991 is 1991813251352.

It is a balanced prime because it is at equal distance from previous prime (2531523181931) and next prime (2531523182051).

It is a cyclic number.

It is not a de Polignac number, because 2531523181991 - 2³⁸ = 2256645275047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531523181931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265761590995 + 1265761590996.

It is an arithmetic number, because the mean of its divisors is an integer number (1265761590996).

Almost surely, 2^{2531523181991} is an apocalyptic number.

2531523181991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531523181991 is an equidigital number, since it uses as much as digits as its factorization.

2531523181991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 50.

The spelling of 2531523181991 in words is "two trillion, five hundred thirty-one billion, five hundred twenty-three million, one hundred eighty-one thousand, nine hundred ninety-one".