91270172 has 12 divisors (see below), whose sum is σ = 182540400. Its totient is φ = 39115776.

The previous prime is 91270159. The next prime is 91270177. The reversal of 91270172 is 27107219.

91270172 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91270177) 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, 1629797 + ... + 1629852.

It is an arithmetic number, because the mean of its divisors is an integer number (15211700).

Almost surely, 2^91270172 is an apocalyptic number.

It is an amenable number.

91270172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91270172 is a wasteful number, since it uses less digits than its factorization.

91270172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259660 (or 3259658 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 91270172 is about 9553.5423796621. The cubic root of 91270172 is about 450.2388394676.

The spelling of 91270172 in words is "ninety-one million, two hundred seventy thousand, one hundred seventy-two".