91180000997 has 4 divisors (see below), whose sum is σ = 91526693280. Its totient is φ = 90833308716.

The previous prime is 91180000993. The next prime is 91180001021. The reversal of 91180000997 is 79900008119.

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 91180000997 - 2² = 91180000993 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 (91180000993) 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, 173345747 + ... + 173346272.

It is an arithmetic number, because the mean of its divisors is an integer number (22881673320).

Almost surely, 2^91180000997 is an apocalyptic number.

It is an amenable number.

91180000997 is a deficient number, since it is larger than the sum of its proper divisors (346692283).

91180000997 is a wasteful number, since it uses less digits than its factorization.

91180000997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346692282.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 91180000997 in words is "ninety-one billion, one hundred eighty million, nine hundred ninety-seven", and thus it is an aban number.