90166973 has 4 divisors (see below), whose sum is σ = 97102908. Its totient is φ = 83231040.

The previous prime is 90166931. The next prime is 90166987. The reversal of 90166973 is 37966109.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26853124 + 63313849 = 5182^2 + 7957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90166973 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 90166973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90166273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3467948 + ... + 3467973.

It is an arithmetic number, because the mean of its divisors is an integer number (24275727).

Almost surely, 2^90166973 is an apocalyptic number.

It is an amenable number.

90166973 is a deficient number, since it is larger than the sum of its proper divisors (6935935).

90166973 is a wasteful number, since it uses less digits than its factorization.

90166973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6935934.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 90166973 is about 9495.6291524048. The cubic root of 90166973 is about 448.4174418131.

The spelling of 90166973 in words is "ninety million, one hundred sixty-six thousand, nine hundred seventy-three".