90661901 has 36 divisors (see below), whose sum is σ = 112288320. Its totient is φ = 72558720.

The previous prime is 90661829. The next prime is 90661933. The reversal of 90661901 is 10916609.

It is a happy number.

It is not a de Polignac number, because 90661901 - 2¹⁰ = 90660877 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 (90661001) 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 35 ways as a sum of consecutive naturals, for example, 1147580 + ... + 1147658.

It is an arithmetic number, because the mean of its divisors is an integer number (3119120).

Almost surely, 2^90661901 is an apocalyptic number.

It is an amenable number.

90661901 is a deficient number, since it is larger than the sum of its proper divisors (21626419).

90661901 is a wasteful number, since it uses less digits than its factorization.

90661901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 90661901 is about 9521.6543205475. The cubic root of 90661901 is about 449.2364021151.

The spelling of 90661901 in words is "ninety million, six hundred sixty-one thousand, nine hundred one".