2001890101 has 4 divisors (see below), whose sum is σ = 2002027104. Its totient is φ = 2001753100.

The previous prime is 2001890089. The next prime is 2001890113. The reversal of 2001890101 is 1010981002.

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 an interprime number because it is at equal distance from previous prime (2001890089) and next prime (2001890113).

It is a cyclic number.

It is not a de Polignac number, because 2001890101 - 2¹³ = 2001881909 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 (2001890161) 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, 43555 + ... + 76816.

It is an arithmetic number, because the mean of its divisors is an integer number (500506776).

Almost surely, 2^2001890101 is an apocalyptic number.

It is an amenable number.

2001890101 is a deficient number, since it is larger than the sum of its proper divisors (137003).

2001890101 is a wasteful number, since it uses less digits than its factorization.

2001890101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137002.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 2001890101 is about 44742.4865312602. The cubic root of 2001890101 is about 1260.3178212708.

Subtracting from 2001890101 its reverse (1010981002), we obtain a palindrome (990909099).

The spelling of 2001890101 in words is "two billion, one million, eight hundred ninety thousand, one hundred one".