91470891 has 4 divisors (see below), whose sum is σ = 121961192. Its totient is φ = 60980592.

The previous prime is 91470859. The next prime is 91470917. The reversal of 91470891 is 19807419.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 91470891 - 2⁵ = 91470859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91470811) 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, 15245146 + ... + 15245151.

It is an arithmetic number, because the mean of its divisors is an integer number (30490298).

Almost surely, 2^91470891 is an apocalyptic number.

91470891 is a deficient number, since it is larger than the sum of its proper divisors (30490301).

91470891 is a wasteful number, since it uses less digits than its factorization.

91470891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30490300.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 91470891 is about 9564.0415620176. The cubic root of 91470891 is about 450.5686490170.

The spelling of 91470891 in words is "ninety-one million, four hundred seventy thousand, eight hundred ninety-one".