91016973090 has 144 divisors (see below), whose sum is σ = 245931940800. Its totient is φ = 23353058880.

The previous prime is 91016973053. The next prime is 91016973127. The reversal of 91016973090 is 9037961019.

It is an interprime number because it is at equal distance from previous prime (91016973053) and next prime (91016973127).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15478771 + ... + 15484649.

It is an arithmetic number, because the mean of its divisors is an integer number (1707860700).

Almost surely, 2^91016973090 is an apocalyptic number.

91016973090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91016973090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122965970400).

91016973090 is an abundant number, since it is smaller than the sum of its proper divisors (154914967710).

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

91016973090 is a wasteful number, since it uses less digits than its factorization.

91016973090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6133 (or 6099 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The spelling of 91016973090 in words is "ninety-one billion, sixteen million, nine hundred seventy-three thousand, ninety".