91889697 has 8 divisors (see below), whose sum is σ = 122585344. Its totient is φ = 61226928.

The previous prime is 91889683. The next prime is 91889701. The reversal of 91889697 is 79698819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91889697 - 2¹⁵ = 91856929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91889617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718 + ... + 13575.

It is an arithmetic number, because the mean of its divisors is an integer number (15323168).

Almost surely, 2^91889697 is an apocalyptic number.

It is an amenable number.

91889697 is a deficient number, since it is larger than the sum of its proper divisors (30695647).

91889697 is a wasteful number, since it uses less digits than its factorization.

91889697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16439.

The product of its digits is 1959552, while the sum is 57.

The square root of 91889697 is about 9585.9113807713. The cubic root of 91889697 is about 451.2552557558.

The spelling of 91889697 in words is "ninety-one million, eight hundred eighty-nine thousand, six hundred ninety-seven".