22161917 has 2 divisors, whose sum is σ = 22161918. Its totient is φ = 22161916.

The previous prime is 22161911. The next prime is 22161929. The reversal of 22161917 is 71916122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20894041 + 1267876 = 4571^2 + 1126^2 .

It is a cyclic number.

It is not a de Polignac number, because 22161917 - 2⁴ = 22161901 is a prime.

It is a super-2 number, since 2×22161917² = 982301130229778, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22161917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22161911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11080958 + 11080959.

It is an arithmetic number, because the mean of its divisors is an integer number (11080959).

Almost surely, 2^22161917 is an apocalyptic number.

It is an amenable number.

22161917 is a deficient number, since it is larger than the sum of its proper divisors (1).

22161917 is an equidigital number, since it uses as much as digits as its factorization.

22161917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 22161917 is about 4707.6445277867. The cubic root of 22161917 is about 280.8896743986.

The spelling of 22161917 in words is "twenty-two million, one hundred sixty-one thousand, nine hundred seventeen".