91071397 has 32 divisors (see below), whose sum is σ = 105753600. Its totient is φ = 77952000.

The previous prime is 91071371. The next prime is 91071413. The reversal of 91071397 is 79317019.

It is a de Polignac number, because none of the positive numbers 2^k-91071397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91071367) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 901647 + ... + 901747.

It is an arithmetic number, because the mean of its divisors is an integer number (3304800).

Almost surely, 2^91071397 is an apocalyptic number.

It is an amenable number.

91071397 is a deficient number, since it is larger than the sum of its proper divisors (14682203).

91071397 is a wasteful number, since it uses less digits than its factorization.

91071397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 91071397 is about 9543.1335000617. The cubic root of 91071397 is about 449.9117473023.

The spelling of 91071397 in words is "ninety-one million, seventy-one thousand, three hundred ninety-seven".