2540645431 has 2 divisors, whose sum is σ = 2540645432. Its totient is φ = 2540645430.

The previous prime is 2540645417. The next prime is 2540645453. The reversal of 2540645431 is 1345460452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2540645431 - 2²³ = 2532256823 is a prime.

It is a super-2 number, since 2×2540645431² = 12909758412122351522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2540645131) 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 as a sum of consecutive naturals, namely, 1270322715 + 1270322716.

It is an arithmetic number, because the mean of its divisors is an integer number (1270322716).

Almost surely, 2^2540645431 is an apocalyptic number.

2540645431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540645431 is an equidigital number, since it uses as much as digits as its factorization.

2540645431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 2540645431 is about 50404.8155536750. The cubic root of 2540645431 is about 1364.5245484605.

The spelling of 2540645431 in words is "two billion, five hundred forty million, six hundred forty-five thousand, four hundred thirty-one".