122972989 has 2 divisors, whose sum is σ = 122972990. Its totient is φ = 122972988.

The previous prime is 122972987. The next prime is 122972999. The reversal of 122972989 is 989279221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 870489 = 11050^2 + 933^2 .

It is a cyclic number.

It is not a de Polignac number, because 122972989 - 2¹ = 122972987 is a prime.

Together with 122972987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122972987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61486494 + 61486495.

It is an arithmetic number, because the mean of its divisors is an integer number (61486495).

Almost surely, 2^122972989 is an apocalyptic number.

It is an amenable number.

122972989 is a deficient number, since it is larger than the sum of its proper divisors (1).

122972989 is an equidigital number, since it uses as much as digits as its factorization.

122972989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 122972989 is about 11089.3186896220. The cubic root of 122972989 is about 497.2825766426.

The spelling of 122972989 in words is "one hundred twenty-two million, nine hundred seventy-two thousand, nine hundred eighty-nine".