91159969501 has 4 divisors (see below), whose sum is σ = 91618060000. Its totient is φ = 90701879004.

The previous prime is 91159969477. The next prime is 91159969519. The reversal of 91159969501 is 10596995119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91159969501 - 2¹¹ = 91159967453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91159963501) 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 3 ways as a sum of consecutive naturals, for example, 229044951 + ... + 229045348.

It is an arithmetic number, because the mean of its divisors is an integer number (22904515000).

Almost surely, 2^91159969501 is an apocalyptic number.

It is an amenable number.

91159969501 is a deficient number, since it is larger than the sum of its proper divisors (458090499).

91159969501 is a wasteful number, since it uses less digits than its factorization.

91159969501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458090498.

The product of its (nonzero) digits is 984150, while the sum is 55.

The spelling of 91159969501 in words is "ninety-one billion, one hundred fifty-nine million, nine hundred sixty-nine thousand, five hundred one".