122113561 has 2 divisors, whose sum is σ = 122113562. Its totient is φ = 122113560.

The previous prime is 122113559. The next prime is 122113571. The reversal of 122113561 is 165311221.

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., 98406400 + 23707161 = 9920^2 + 4869^2 .

It is a cyclic number.

It is not a de Polignac number, because 122113561 - 2¹ = 122113559 is a prime.

Together with 122113559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (122113531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61056780 + 61056781.

It is an arithmetic number, because the mean of its divisors is an integer number (61056781).

Almost surely, 2^122113561 is an apocalyptic number.

It is an amenable number.

122113561 is a deficient number, since it is larger than the sum of its proper divisors (1).

122113561 is an equidigital number, since it uses as much as digits as its factorization.

122113561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 122113561 is about 11050.5004864033. The cubic root of 122113561 is about 496.1214054725.

Adding to 122113561 its reverse (165311221), we get a palindrome (287424782).

The spelling of 122113561 in words is "one hundred twenty-two million, one hundred thirteen thousand, five hundred sixty-one".