90991201 has 16 divisors (see below), whose sum is σ = 106827264. Its totient is φ = 75884544.

The previous prime is 90991193. The next prime is 90991213. The reversal of 90991201 is 10219909.

It is a cyclic number.

It is not a de Polignac number, because 90991201 - 2³ = 90991193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90991501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62781 + ... + 64213.

It is an arithmetic number, because the mean of its divisors is an integer number (6676704).

Almost surely, 2^90991201 is an apocalyptic number.

It is an amenable number.

90991201 is a deficient number, since it is larger than the sum of its proper divisors (15836063).

90991201 is a wasteful number, since it uses less digits than its factorization.

90991201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 90991201 is about 9538.9308101065. The cubic root of 90991201 is about 449.7796468490.

The spelling of 90991201 in words is "ninety million, nine hundred ninety-one thousand, two hundred one".