90900101 has 4 divisors (see below), whose sum is σ = 91800204. Its totient is φ = 90000000.

The previous prime is 90900041. The next prime is 90900109. The reversal of 90900101 is 10100909.

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 81450625 + 9449476 = 9025^2 + 3074^2 .

It is a cyclic number.

It is not a de Polignac number, because 90900101 - 2²⁶ = 23791237 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 (90900109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449900 + ... + 450101.

It is an arithmetic number, because the mean of its divisors is an integer number (22950051).

Almost surely, 2^90900101 is an apocalyptic number.

It is an amenable number.

90900101 is a deficient number, since it is larger than the sum of its proper divisors (900103).

90900101 is a wasteful number, since it uses less digits than its factorization.

90900101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900102.

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

The square root of 90900101 is about 9534.1544459905. The cubic root of 90900101 is about 449.6294909085.

It can be divided in two parts, 90900 and 101, that multiplied together give a square (9180900 = 3030²).

The spelling of 90900101 in words is "ninety million, nine hundred thousand, one hundred one".