2531542445491 has 2 divisors, whose sum is σ = 2531542445492. Its totient is φ = 2531542445490.

The previous prime is 2531542445489. The next prime is 2531542445503. The reversal of 2531542445491 is 1945442451352.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2531542445491 - 2¹ = 2531542445489 is a prime.

Together with 2531542445489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2531542445191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265771222745 + 1265771222746.

It is an arithmetic number, because the mean of its divisors is an integer number (1265771222746).

Almost surely, 2^{2531542445491} is an apocalyptic number.

2531542445491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531542445491 is an equidigital number, since it uses as much as digits as its factorization.

2531542445491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 49.

The spelling of 2531542445491 in words is "two trillion, five hundred thirty-one billion, five hundred forty-two million, four hundred forty-five thousand, four hundred ninety-one".