91571060865539 has 12 divisors (see below), whose sum is σ = 91933700148744. Its totient is φ = 91209846534144.

The previous prime is 91571060865523. The next prime is 91571060865553. The reversal of 91571060865539 is 93556806017519.

It is not a de Polignac number, because 91571060865539 - 2⁴ = 91571060865523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91571060825539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2328669932 + ... + 2328709254.

It is an arithmetic number, because the mean of its divisors is an integer number (7661141679062).

Almost surely, 2^{91571060865539} is an apocalyptic number.

91571060865539 is a deficient number, since it is larger than the sum of its proper divisors (362639283205).

91571060865539 is an equidigital number, since it uses as much as digits as its factorization.

91571060865539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75094 (or 74837 counting only the distinct ones).

The product of its (nonzero) digits is 61236000, while the sum is 65.

The spelling of 91571060865539 in words is "ninety-one trillion, five hundred seventy-one billion, sixty million, eight hundred sixty-five thousand, five hundred thirty-nine".