2138517717 has 16 divisors (see below), whose sum is σ = 3313927680. Its totient is φ = 1201297392.

The previous prime is 2138517709. The next prime is 2138517757. The reversal of 2138517717 is 7177158312.

It is not a de Polignac number, because 2138517717 - 2³ = 2138517709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138517757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861763 + ... + 864240.

It is an arithmetic number, because the mean of its divisors is an integer number (207120480).

Almost surely, 2^2138517717 is an apocalyptic number.

It is an amenable number.

2138517717 is a deficient number, since it is larger than the sum of its proper divisors (1175409963).

2138517717 is a wasteful number, since it uses less digits than its factorization.

2138517717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726072.

The product of its digits is 82320, while the sum is 42.

The square root of 2138517717 is about 46244.1100790144. The cubic root of 2138517717 is about 1288.3611415851.

The spelling of 2138517717 in words is "two billion, one hundred thirty-eight million, five hundred seventeen thousand, seven hundred seventeen".