91321952287504 has 15 divisors (see below), whose sum is σ = 176936356618023. Its totient is φ = 45660957031248.

The previous prime is 91321952287439. The next prime is 91321952287507. The reversal of 91321952287504 is 40578225912319.

The square root of 91321952287504 is 9556252.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91321952287507) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 37030477 + ... + 39419539.

Almost surely, 2^{91321952287504} is an apocalyptic number.

91321952287504 is the 9556252-nd square number.

It is an amenable number.

91321952287504 is a deficient number, since it is larger than the sum of its proper divisors (85614404330519).

91321952287504 is an frugal number, since it uses more digits than its factorization.

91321952287504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778134 (or 2389065 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 91321952287504 in words is "ninety-one trillion, three hundred twenty-one billion, nine hundred fifty-two million, two hundred eighty-seven thousand, five hundred four".