91423285 has 4 divisors (see below), whose sum is σ = 109707948. Its totient is φ = 73138624.

The previous prime is 91423279. The next prime is 91423291. The reversal of 91423285 is 58232419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58232419 = 7 ⋅8318917.

It is an interprime number because it is at equal distance from previous prime (91423279) and next prime (91423291).

It can be written as a sum of positive squares in 2 ways, for example, as 13242321 + 78180964 = 3639^2 + 8842^2 .

It is a cyclic number.

It is not a de Polignac number, because 91423285 - 2⁵ = 91423253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91423285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9142324 + ... + 9142333.

It is an arithmetic number, because the mean of its divisors is an integer number (27426987).

Almost surely, 2^91423285 is an apocalyptic number.

It is an amenable number.

91423285 is a deficient number, since it is larger than the sum of its proper divisors (18284663).

91423285 is a wasteful number, since it uses less digits than its factorization.

91423285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18284662.

The product of its digits is 17280, while the sum is 34.

The square root of 91423285 is about 9561.5524367124. The cubic root of 91423285 is about 450.4904693428.

The spelling of 91423285 in words is "ninety-one million, four hundred twenty-three thousand, two hundred eighty-five".