91617079212 has 240 divisors, whose sum is σ = 262699557120. Its totient is φ = 27760320000.

The previous prime is 91617079171. The next prime is 91617079217. The reversal of 91617079212 is 21297071619.

91617079212 is a `hidden beast` number, since 9 + 1 + 617 + 0 + 7 + 9 + 21 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (91617079217) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10772962 + ... + 10781462.

It is an arithmetic number, because the mean of its divisors is an integer number (1094581488).

Almost surely, 2^91617079212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91617079212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131349778560).

91617079212 is an abundant number, since it is smaller than the sum of its proper divisors (171082477908).

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

91617079212 is a wasteful number, since it uses less digits than its factorization.

91617079212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8614 (or 8603 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The spelling of 91617079212 in words is "ninety-one billion, six hundred seventeen million, seventy-nine thousand, two hundred twelve".