91373802961 has 45 divisors (see below), whose sum is σ = 110702222793. Its totient is φ = 75413063880.

The previous prime is 91373802959. The next prime is 91373803033. The reversal of 91373802961 is 16920837319.

The square root of 91373802961 is 302281.

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

It is not a de Polignac number, because 91373802961 - 2¹ = 91373802959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91373802461) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 459164740 + ... + 459164938.

Almost surely, 2^91373802961 is an apocalyptic number.

91373802961 is the 302281-st square number.

91373802961 is the 151141-st centered octagonal number.

It is an amenable number.

91373802961 is a deficient number, since it is larger than the sum of its proper divisors (19328419832).

91373802961 is an frugal number, since it uses more digits than its factorization.

91373802961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

Multiplying 91373802961 by its sum of digits (49), we get a square (4477316345089 = 2115967²).

91373802961 divided by its sum of digits (49) gives a square (1864771489 = 43183²).

The spelling of 91373802961 in words is "ninety-one billion, three hundred seventy-three million, eight hundred two thousand, nine hundred sixty-one".