1631440254539 has 2 divisors, whose sum is σ = 1631440254540. Its totient is φ = 1631440254538.

The previous prime is 1631440254527. The next prime is 1631440254599. The reversal of 1631440254539 is 9354520441361.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1631440254539 - 2²⁴ = 1631423477323 is a prime.

It is a super-2 number, since 2×1631440254539² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1631440254493 and 1631440254502.

It is not a weakly prime, because it can be changed into another prime (1631440254599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815720127269 + 815720127270.

It is an arithmetic number, because the mean of its divisors is an integer number (815720127270).

Almost surely, 2^{1631440254539} is an apocalyptic number.

1631440254539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631440254539 is an equidigital number, since it uses as much as digits as its factorization.

1631440254539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 1631440254539 in words is "one trillion, six hundred thirty-one billion, four hundred forty million, two hundred fifty-four thousand, five hundred thirty-nine".