122711989 has 2 divisors, whose sum is σ = 122711990. Its totient is φ = 122711988.

The previous prime is 122711983. The next prime is 122711993. The reversal of 122711989 is 989117221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68807025 + 53904964 = 8295^2 + 7342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122711989 is a prime.

It is a super-2 number, since 2×122711989² = 30116464488672242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122711983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61355994 + 61355995.

It is an arithmetic number, because the mean of its divisors is an integer number (61355995).

Almost surely, 2^122711989 is an apocalyptic number.

It is an amenable number.

122711989 is a deficient number, since it is larger than the sum of its proper divisors (1).

122711989 is an equidigital number, since it uses as much as digits as its factorization.

122711989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 122711989 is about 11077.5443578439. The cubic root of 122711989 is about 496.9305137347.

The spelling of 122711989 in words is "one hundred twenty-two million, seven hundred eleven thousand, nine hundred eighty-nine".