90990001 has 8 divisors (see below), whose sum is σ = 100531584. Its totient is φ = 81913920.

The previous prime is 90989989. The next prime is 90990007. The reversal of 90990001 is 10009909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90990001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90990007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115965 + ... + 116746.

It is an arithmetic number, because the mean of its divisors is an integer number (12566448).

Almost surely, 2^90990001 is an apocalyptic number.

It is an amenable number.

90990001 is a deficient number, since it is larger than the sum of its proper divisors (9541583).

90990001 is a wasteful number, since it uses less digits than its factorization.

90990001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232751.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 90990001 is about 9538.8679097679. The cubic root of 90990001 is about 449.7776695957. Note that the first 3 decimals are identical.

The spelling of 90990001 in words is "ninety million, nine hundred ninety thousand, one".