91397000844 has 36 divisors (see below), whose sum is σ = 237275400544. Its totient is φ = 29642270112.

The previous prime is 91397000843. The next prime is 91397000857. The reversal of 91397000844 is 44800079319.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 91397000844.

It is not an unprimeable number, because it can be changed into a prime (91397000843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34306852 + ... + 34309515.

Almost surely, 2^91397000844 is an apocalyptic number.

It is an amenable number.

91397000844 is an abundant number, since it is smaller than the sum of its proper divisors (145878399700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91397000844 is a wasteful number, since it uses less digits than its factorization.

91397000844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68616414 (or 68616409 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 91397000844 in words is "ninety-one billion, three hundred ninety-seven million, eight hundred forty-four", and thus it is an aban number.