91071172 has 12 divisors (see below), whose sum is σ = 162381996. Its totient is φ = 44676320.

The previous prime is 91071163. The next prime is 91071259. The reversal of 91071172 is 27117019.

It can be written as a sum of positive squares in 2 ways, for example, as 37136836 + 53934336 = 6094^2 + 7344^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91071172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214579 + ... + 215002.

It is an arithmetic number, because the mean of its divisors is an integer number (13531833).

Almost surely, 2^91071172 is an apocalyptic number.

It is an amenable number.

91071172 is a deficient number, since it is larger than the sum of its proper divisors (71310824).

91071172 is a wasteful number, since it uses less digits than its factorization.

91071172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429638 (or 429636 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 91071172 is about 9543.1217114737. The cubic root of 91071172 is about 449.9113767863.

The spelling of 91071172 in words is "ninety-one million, seventy-one thousand, one hundred seventy-two".