91691418441 has 16 divisors (see below), whose sum is σ = 139727304704. Its totient is φ = 52392453264.

The previous prime is 91691418437. The next prime is 91691418449. The reversal of 91691418441 is 14481419619.

It is not a de Polignac number, because 91691418441 - 2² = 91691418437 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91691418449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363456 + ... + 561678.

It is an arithmetic number, because the mean of its divisors is an integer number (8732956544).

Almost surely, 2^91691418441 is an apocalyptic number.

It is an amenable number.

91691418441 is a deficient number, since it is larger than the sum of its proper divisors (48035886263).

91691418441 is a wasteful number, since it uses less digits than its factorization.

91691418441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220260.

The product of its digits is 248832, while the sum is 48.

The spelling of 91691418441 in words is "ninety-one billion, six hundred ninety-one million, four hundred eighteen thousand, four hundred forty-one".