11717997 has 4 divisors (see below), whose sum is σ = 15624000. Its totient is φ = 7811996.

The previous prime is 11717989. The next prime is 11717999. The reversal of 11717997 is 79971711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79971711 = 3 ⋅26657237.

It is a cyclic number.

It is not a de Polignac number, because 11717997 - 2³ = 11717989 is a prime.

It is a super-2 number, since 2×11717997² = 274622907384018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11717999) 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, 1952997 + ... + 1953002.

It is an arithmetic number, because the mean of its divisors is an integer number (3906000).

Almost surely, 2^11717997 is an apocalyptic number.

It is an amenable number.

11717997 is a deficient number, since it is larger than the sum of its proper divisors (3906003).

11717997 is an equidigital number, since it uses as much as digits as its factorization.

11717997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906002.

The product of its digits is 27783, while the sum is 42.

The square root of 11717997 is about 3423.1559999509. The cubic root of 11717997 is about 227.1352089623.

The spelling of 11717997 in words is "eleven million, seven hundred seventeen thousand, nine hundred ninety-seven".