91664098 has 4 divisors (see below), whose sum is σ = 137496150. Its totient is φ = 45832048.

The previous prime is 91664087. The next prime is 91664101. The reversal of 91664098 is 89046619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89046619 = 1619 ⋅55001.

It can be written as a sum of positive squares in only one way, i.e., 68939809 + 22724289 = 8303^2 + 4767^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22916023 + ... + 22916026.

Almost surely, 2^91664098 is an apocalyptic number.

91664098 is a deficient number, since it is larger than the sum of its proper divisors (45832052).

91664098 is a wasteful number, since it uses less digits than its factorization.

91664098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45832051.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 91664098 is about 9574.1369323819. The cubic root of 91664098 is about 450.8856598752.

The spelling of 91664098 in words is "ninety-one million, six hundred sixty-four thousand, ninety-eight".