2101949839 has 8 divisors (see below), whose sum is σ = 2341824768. Its totient is φ = 1870206360.

The previous prime is 2101949831. The next prime is 2101949849. The reversal of 2101949839 is 9389491012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101949839 - 2³ = 2101949831 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 (2101949831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2032317 + ... + 2033350.

It is an arithmetic number, because the mean of its divisors is an integer number (292728096).

Almost surely, 2^2101949839 is an apocalyptic number.

2101949839 is a deficient number, since it is larger than the sum of its proper divisors (239874929).

2101949839 is a wasteful number, since it uses less digits than its factorization.

2101949839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065725.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 2101949839 is about 45847.0265011811. The cubic root of 2101949839 is about 1280.9753794007.

The spelling of 2101949839 in words is "two billion, one hundred one million, nine hundred forty-nine thousand, eight hundred thirty-nine".