122511989 has 2 divisors, whose sum is σ = 122511990. Its totient is φ = 122511988.

The previous prime is 122511953. The next prime is 122512003. The reversal of 122511989 is 989115221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61936900 + 60575089 = 7870^2 + 7783^2 .

It is a cyclic number.

It is not a de Polignac number, because 122511989 - 2⁸ = 122511733 is a prime.

It is a super-2 number, since 2×122511989² = 30018374897472242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122511089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61255994 + 61255995.

It is an arithmetic number, because the mean of its divisors is an integer number (61255995).

Almost surely, 2^122511989 is an apocalyptic number.

It is an amenable number.

122511989 is a deficient number, since it is larger than the sum of its proper divisors (1).

122511989 is an equidigital number, since it uses as much as digits as its factorization.

122511989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 38.

The square root of 122511989 is about 11068.5134051507. The cubic root of 122511989 is about 496.6603957488.

The spelling of 122511989 in words is "one hundred twenty-two million, five hundred eleven thousand, nine hundred eighty-nine".