122512561 has 2 divisors, whose sum is σ = 122512562. Its totient is φ = 122512560.

The previous prime is 122512549. The next prime is 122512571. The reversal of 122512561 is 165215221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112784400 + 9728161 = 10620^2 + 3119^2 .

It is an emirp because it is prime and its reverse (165215221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122512561 - 2⁵ = 122512529 is a prime.

It is not a weakly prime, because it can be changed into another prime (122512531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61256280 + 61256281.

It is an arithmetic number, because the mean of its divisors is an integer number (61256281).

Almost surely, 2^122512561 is an apocalyptic number.

It is an amenable number.

122512561 is a deficient number, since it is larger than the sum of its proper divisors (1).

122512561 is an equidigital number, since it uses as much as digits as its factorization.

122512561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 122512561 is about 11068.5392441821. The cubic root of 122512561 is about 496.6611687053.

Adding to 122512561 its reverse (165215221), we get a palindrome (287727782).

The spelling of 122512561 in words is "one hundred twenty-two million, five hundred twelve thousand, five hundred sixty-one".