2101903309 has 32 divisors (see below), whose sum is σ = 2418647040. Its totient is φ = 1809787200.

The previous prime is 2101903303. The next prime is 2101903313. The reversal of 2101903309 is 9033091012.

It is a cyclic number.

It is not a de Polignac number, because 2101903309 - 2²¹ = 2099806157 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 (2101903303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2164194 + ... + 2165164.

It is an arithmetic number, because the mean of its divisors is an integer number (75582720).

Almost surely, 2^2101903309 is an apocalyptic number.

It is an amenable number.

2101903309 is a deficient number, since it is larger than the sum of its proper divisors (316743731).

2101903309 is a wasteful number, since it uses less digits than its factorization.

2101903309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 2101903309 is about 45846.5190499780. The cubic root of 2101903309 is about 1280.9659271891.

The spelling of 2101903309 in words is "two billion, one hundred one million, nine hundred three thousand, three hundred nine".