122957561 has 2 divisors, whose sum is σ = 122957562. Its totient is φ = 122957560.

The previous prime is 122957551. The next prime is 122957581. The reversal of 122957561 is 165759221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97515625 + 25441936 = 9875^2 + 5044^2 .

It is an emirp because it is prime and its reverse (165759221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122957561 is a prime.

It is not a weakly prime, because it can be changed into another prime (122957551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61478780 + 61478781.

It is an arithmetic number, because the mean of its divisors is an integer number (61478781).

Almost surely, 2^122957561 is an apocalyptic number.

It is an amenable number.

122957561 is a deficient number, since it is larger than the sum of its proper divisors (1).

122957561 is an equidigital number, since it uses as much as digits as its factorization.

122957561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 38.

The square root of 122957561 is about 11088.6230434622. The cubic root of 122957561 is about 497.2617796732.

The spelling of 122957561 in words is "one hundred twenty-two million, nine hundred fifty-seven thousand, five hundred sixty-one".