2117690709 has 4 divisors (see below), whose sum is σ = 2823587616. Its totient is φ = 1411793804.

The previous prime is 2117690677. The next prime is 2117690723. The reversal of 2117690709 is 9070967112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2117690709 - 2⁵ = 2117690677 is a prime.

It is a super-2 number, since 2×2117690709² = 8969227877969845362, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117690749) 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, 352948449 + ... + 352948454.

It is an arithmetic number, because the mean of its divisors is an integer number (705896904).

Almost surely, 2^2117690709 is an apocalyptic number.

It is an amenable number.

2117690709 is a deficient number, since it is larger than the sum of its proper divisors (705896907).

2117690709 is an equidigital number, since it uses as much as digits as its factorization.

2117690709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705896906.

The product of its (nonzero) digits is 47628, while the sum is 42.

The square root of 2117690709 is about 46018.3736022906. The cubic root of 2117690709 is about 1284.1650435404.

The spelling of 2117690709 in words is "two billion, one hundred seventeen million, six hundred ninety thousand, seven hundred nine".