90166597 has 4 divisors (see below), whose sum is σ = 93275820. Its totient is φ = 87057376.

The previous prime is 90166561. The next prime is 90166613. The reversal of 90166597 is 79566109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79566109 = 7 ⋅11366587.

It can be written as a sum of positive squares in 2 ways, for example, as 76580001 + 13586596 = 8751^2 + 3686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90166597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90166537) 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, 1554568 + ... + 1554625.

It is an arithmetic number, because the mean of its divisors is an integer number (23318955).

Almost surely, 2^90166597 is an apocalyptic number.

It is an amenable number.

90166597 is a deficient number, since it is larger than the sum of its proper divisors (3109223).

90166597 is a wasteful number, since it uses less digits than its factorization.

90166597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109222.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 90166597 is about 9495.6093538014. The cubic root of 90166597 is about 448.4168185058.

The spelling of 90166597 in words is "ninety million, one hundred sixty-six thousand, five hundred ninety-seven".