90168013 has 4 divisors (see below), whose sum is σ = 97104028. Its totient is φ = 83232000.

The previous prime is 90167969. The next prime is 90168037. The reversal of 90168013 is 31086109.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31086109 = 19 ⋅1636111.

It can be written as a sum of positive squares in 2 ways, for example, as 55086084 + 35081929 = 7422^2 + 5923^2 .

It is a cyclic number.

It is not a de Polignac number, because 90168013 - 2⁹ = 90167501 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 (90168413) 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, 3467988 + ... + 3468013.

It is an arithmetic number, because the mean of its divisors is an integer number (24276007).

Almost surely, 2^90168013 is an apocalyptic number.

It is an amenable number.

90168013 is a deficient number, since it is larger than the sum of its proper divisors (6936015).

90168013 is a wasteful number, since it uses less digits than its factorization.

90168013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936014.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 90168013 is about 9495.6839142844. The cubic root of 90168013 is about 448.4191658455.

The spelling of 90168013 in words is "ninety million, one hundred sixty-eight thousand, thirteen".