90166513 has 4 divisors (see below), whose sum is σ = 90740980. Its totient is φ = 89592048.

The previous prime is 90166511. The next prime is 90166519. The reversal of 90166513 is 31566109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31566109 = 79 ⋅399571.

It can be written as a sum of positive squares in 2 ways, for example, as 37051569 + 53114944 = 6087^2 + 7288^2 .

It is a cyclic number.

It is not a de Polignac number, because 90166513 - 2¹ = 90166511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90166511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286998 + ... + 287311.

It is an arithmetic number, because the mean of its divisors is an integer number (22685245).

Almost surely, 2^90166513 is an apocalyptic number.

It is an amenable number.

90166513 is a deficient number, since it is larger than the sum of its proper divisors (574467).

90166513 is a wasteful number, since it uses less digits than its factorization.

90166513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574466.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 90166513 is about 9495.6049307035. The cubic root of 90166513 is about 448.4166792561.

The spelling of 90166513 in words is "ninety million, one hundred sixty-six thousand, five hundred thirteen".