90001901 has 16 divisors (see below), whose sum is σ = 100761408. Its totient is φ = 79699200.

The previous prime is 90001853. The next prime is 90001909. The reversal of 90001901 is 10910009.

It is a cyclic number.

It is not a de Polignac number, because 90001901 - 2¹⁰ = 90000877 is a prime.

It is a super-2 number, since 2×90001901² = 16200684367227602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90001909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75230 + ... + 76416.

It is an arithmetic number, because the mean of its divisors is an integer number (6297588).

Almost surely, 2^90001901 is an apocalyptic number.

It is an amenable number.

90001901 is a deficient number, since it is larger than the sum of its proper divisors (10759507).

90001901 is a wasteful number, since it uses less digits than its factorization.

90001901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 90001901 is about 9486.9331714733. The cubic root of 90001901 is about 448.1436298744.

It can be divided in two parts, 9000 and 1901, that added together give a palindrome (10901).

The spelling of 90001901 in words is "ninety million, one thousand, nine hundred one".