91009264481 has 4 divisors (see below), whose sum is σ = 91330852272. Its totient is φ = 90687676692.

The previous prime is 91009264459. The next prime is 91009264531. The reversal of 91009264481 is 18446290019.

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 91009264481 - 2³⁰ = 89935522657 is a prime.

It is a super-2 number, since 2×91009264481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91009264421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160793471 + ... + 160794036.

It is an arithmetic number, because the mean of its divisors is an integer number (22832713068).

Almost surely, 2^91009264481 is an apocalyptic number.

It is an amenable number.

91009264481 is a deficient number, since it is larger than the sum of its proper divisors (321587791).

91009264481 is a wasteful number, since it uses less digits than its factorization.

91009264481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321587790.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 91009264481 in words is "ninety-one billion, nine million, two hundred sixty-four thousand, four hundred eighty-one".