22161617 has 2 divisors, whose sum is σ = 22161618. Its totient is φ = 22161616.

The previous prime is 22161599. The next prime is 22161647. The reversal of 22161617 is 71616122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12327121 + 9834496 = 3511^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 22161617 - 2²⁰ = 21113041 is a prime.

It is a super-2 number, since 2×22161617² = 982274536109378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22161647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11080808 + 11080809.

It is an arithmetic number, because the mean of its divisors is an integer number (11080809).

Almost surely, 2^22161617 is an apocalyptic number.

It is an amenable number.

22161617 is a deficient number, since it is larger than the sum of its proper divisors (1).

22161617 is an equidigital number, since it uses as much as digits as its factorization.

22161617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 22161617 is about 4707.6126646104. The cubic root of 22161617 is about 280.8884069499. Note that the first 3 decimals are identical.

Adding to 22161617 its reverse (71616122), we get a palindrome (93777739).

It can be divided in two parts, 2 and 2161617, that multiplied together give a palindrome (4323234).

The spelling of 22161617 in words is "twenty-two million, one hundred sixty-one thousand, six hundred seventeen".