91916504304721 has 8 divisors (see below), whose sum is σ = 92950993289160. Its totient is φ = 90882053526528.

The previous prime is 91916504304697. The next prime is 91916504304727. The reversal of 91916504304721 is 12740340561919.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1101322214721 + 90815182090000 = 1049439^2 + 9529700^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91916504304721 - 2¹¹ = 91916504302673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91916504304727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4699096 + ... + 14349721.

It is an arithmetic number, because the mean of its divisors is an integer number (11618874161145).

Almost surely, 2^{91916504304721} is an apocalyptic number.

It is an amenable number.

91916504304721 is a deficient number, since it is larger than the sum of its proper divisors (1034488984439).

91916504304721 is a wasteful number, since it uses less digits than its factorization.

91916504304721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19103123.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 91916504304721 in words is "ninety-one trillion, nine hundred sixteen billion, five hundred four million, three hundred four thousand, seven hundred twenty-one".