2001623109 has 4 divisors (see below), whose sum is σ = 2668830816. Its totient is φ = 1334415404.

The previous prime is 2001623101. The next prime is 2001623111. The reversal of 2001623109 is 9013261002.

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 not a de Polignac number, because 2001623109 - 2³ = 2001623101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001623101) 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, 333603849 + ... + 333603854.

It is an arithmetic number, because the mean of its divisors is an integer number (667207704).

Almost surely, 2^2001623109 is an apocalyptic number.

It is an amenable number.

2001623109 is a deficient number, since it is larger than the sum of its proper divisors (667207707).

2001623109 is an equidigital number, since it uses as much as digits as its factorization.

2001623109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667207706.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2001623109 is about 44739.5027799818. The cubic root of 2001623109 is about 1260.2617892679.

The spelling of 2001623109 in words is "two billion, one million, six hundred twenty-three thousand, one hundred nine".