122215661 has 2 divisors, whose sum is σ = 122215662. Its totient is φ = 122215660.

The previous prime is 122215603. The next prime is 122215693. The reversal of 122215661 is 166512221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103022500 + 19193161 = 10150^2 + 4381^2 .

It is an emirp because it is prime and its reverse (166512221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122215661 - 2²² = 118021357 is a prime.

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 122215661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122215061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61107830 + 61107831.

It is an arithmetic number, because the mean of its divisors is an integer number (61107831).

Almost surely, 2^122215661 is an apocalyptic number.

It is an amenable number.

122215661 is a deficient number, since it is larger than the sum of its proper divisors (1).

122215661 is an equidigital number, since it uses as much as digits as its factorization.

122215661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 122215661 is about 11055.1192214286. The cubic root of 122215661 is about 496.2596371432.

Adding to 122215661 its reverse (166512221), we get a palindrome (288727882).

The spelling of 122215661 in words is "one hundred twenty-two million, two hundred fifteen thousand, six hundred sixty-one".