1531927915597 has 2 divisors, whose sum is σ = 1531927915598. Its totient is φ = 1531927915596.

The previous prime is 1531927915547. The next prime is 1531927915603. The reversal of 1531927915597 is 7955197291351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1502718029316 + 29209886281 = 1225854^2 + 170909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531927915597 - 2²⁷ = 1531793697869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531927915547) 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, 765963957798 + 765963957799.

It is an arithmetic number, because the mean of its divisors is an integer number (765963957799).

Almost surely, 2^{1531927915597} is an apocalyptic number.

It is an amenable number.

1531927915597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531927915597 is an equidigital number, since it uses as much as digits as its factorization.

1531927915597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26790750, while the sum is 64.

The spelling of 1531927915597 in words is "one trillion, five hundred thirty-one billion, nine hundred twenty-seven million, nine hundred fifteen thousand, five hundred ninety-seven".