91037321657104 has 135 divisors (see below), whose sum is σ = 185090991751029. Its totient is φ = 43375731315840.

The previous prime is 91037321657063. The next prime is 91037321657111. The reversal of 91037321657104 is 40175612373019.

The square root of 91037321657104 is 9541348.

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

It can be written as a sum of positive squares in only one way, i.e., 47737763199504 + 43299558457600 = 6909252^2 + 6580240^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 91864098049 + ... + 91864099039.

Almost surely, 2^{91037321657104} is an apocalyptic number.

91037321657104 is the 9541348-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91037321657104

91037321657104 is an abundant number, since it is smaller than the sum of its proper divisors (94053670093925).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91037321657104 is an frugal number, since it uses more digits than its factorization.

91037321657104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 91037321657104 in words is "ninety-one trillion, thirty-seven billion, three hundred twenty-one million, six hundred fifty-seven thousand, one hundred four".