2117312738 has 6 divisors (see below), whose sum is σ = 3176066721. Its totient is φ = 1058623832.

The previous prime is 2117312723. The next prime is 2117312749. The reversal of 2117312738 is 8372137112.

It can be written as a sum of positive squares in 2 ways, for example, as 1174638529 + 942674209 = 34273^2 + 30703^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=32537.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2117312698 and 2117312707.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 48806 + ... + 81342.

Almost surely, 2^2117312738 is an apocalyptic number.

2117312738 is a deficient number, since it is larger than the sum of its proper divisors (1058753983).

2117312738 is an frugal number, since it uses more digits than its factorization.

2117312738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65076 (or 32539 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 2117312738 is about 46014.2666789334. The cubic root of 2117312738 is about 1284.0886386113.

Multiplying 2117312738 by its product of digits (14112), we get a square (29879517358656 = 5466216²).

The spelling of 2117312738 in words is "two billion, one hundred seventeen million, three hundred twelve thousand, seven hundred thirty-eight".