90051979 has 4 divisors (see below), whose sum is σ = 90074160. Its totient is φ = 90029800.

The previous prime is 90051977. The next prime is 90052051. The reversal of 90051979 is 97915009.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90051979 - 2¹ = 90051977 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90051977) 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, 3064 + ... + 13765.

It is an arithmetic number, because the mean of its divisors is an integer number (22518540).

Almost surely, 2^90051979 is an apocalyptic number.

90051979 is a deficient number, since it is larger than the sum of its proper divisors (22181).

90051979 is a wasteful number, since it uses less digits than its factorization.

90051979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22180.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 90051979 is about 9489.5721189103. The cubic root of 90051979 is about 448.2267317326.

The spelling of 90051979 in words is "ninety million, fifty-one thousand, nine hundred seventy-nine".