2138715911 has 4 divisors (see below), whose sum is σ = 2170637112. Its totient is φ = 2106794712.

The previous prime is 2138715899. The next prime is 2138715919. The reversal of 2138715911 is 1195178312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2138715911 - 2³⁰ = 1064974087 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 (2138715919) 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, 15960500 + ... + 15960633.

It is an arithmetic number, because the mean of its divisors is an integer number (542659278).

Almost surely, 2^2138715911 is an apocalyptic number.

2138715911 is a deficient number, since it is larger than the sum of its proper divisors (31921201).

2138715911 is an equidigital number, since it uses as much as digits as its factorization.

2138715911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31921200.

The product of its digits is 15120, while the sum is 38.

The square root of 2138715911 is about 46246.2529401032. The cubic root of 2138715911 is about 1288.4009413583.

The spelling of 2138715911 in words is "two billion, one hundred thirty-eight million, seven hundred fifteen thousand, nine hundred eleven".