201090101 has 4 divisors (see below), whose sum is σ = 201170304. Its totient is φ = 201009900.

The previous prime is 201090083. The next prime is 201090103. The reversal of 201090101 is 101090102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201090101 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 (201090103) 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, 36215 + ... + 41396.

It is an arithmetic number, because the mean of its divisors is an integer number (50292576).

Almost surely, 2^201090101 is an apocalyptic number.

It is an amenable number.

201090101 is a deficient number, since it is larger than the sum of its proper divisors (80203).

201090101 is an equidigital number, since it uses as much as digits as its factorization.

201090101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80202.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 201090101 is about 14180.6241400017. The cubic root of 201090101 is about 585.8641146483.

Subtracting from 201090101 its reverse (101090102), we obtain a palindrome (99999999).

The spelling of 201090101 in words is "two hundred one million, ninety thousand, one hundred one".