122516621 has 2 divisors, whose sum is σ = 122516622. Its totient is φ = 122516620.

The previous prime is 122516587. The next prime is 122516623. The reversal of 122516621 is 126615221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121110025 + 1406596 = 11005^2 + 1186^2 .

It is a cyclic number.

It is not a de Polignac number, because 122516621 - 2¹⁸ = 122254477 is a prime.

Together with 122516623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122516623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61258310 + 61258311.

It is an arithmetic number, because the mean of its divisors is an integer number (61258311).

Almost surely, 2^122516621 is an apocalyptic number.

It is an amenable number.

122516621 is a deficient number, since it is larger than the sum of its proper divisors (1).

122516621 is an equidigital number, since it uses as much as digits as its factorization.

122516621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 122516621 is about 11068.7226453643. The cubic root of 122516621 is about 496.6666550055. Note that the first 4 decimals are identical.

The spelling of 122516621 in words is "one hundred twenty-two million, five hundred sixteen thousand, six hundred twenty-one".