12161917 has 4 divisors (see below), whose sum is σ = 12690720. Its totient is φ = 11633116.

The previous prime is 12161911. The next prime is 12161923. The reversal of 12161917 is 71916121.

12161917 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (12161911) and next prime (12161923).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12161917 is a prime.

It is a super-2 number, since 2×12161917² = 295824450229778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12161911) 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, 264367 + ... + 264412.

It is an arithmetic number, because the mean of its divisors is an integer number (3172680).

Almost surely, 2^12161917 is an apocalyptic number.

It is an amenable number.

12161917 is a deficient number, since it is larger than the sum of its proper divisors (528803).

12161917 is an equidigital number, since it uses as much as digits as its factorization.

12161917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528802.

The product of its digits is 756, while the sum is 28.

The square root of 12161917 is about 3487.3940127264. The cubic root of 12161917 is about 229.9679665532.

The spelling of 12161917 in words is "twelve million, one hundred sixty-one thousand, nine hundred seventeen".