122115989 has 2 divisors, whose sum is σ = 122115990. Its totient is φ = 122115988.

The previous prime is 122115977. The next prime is 122116003. The reversal of 122115989 is 989511221.

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., 73702225 + 48413764 = 8585^2 + 6958^2 .

It is a cyclic number.

It is not a de Polignac number, because 122115989 - 2²⁰ = 121067413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122115689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61057994 + 61057995.

It is an arithmetic number, because the mean of its divisors is an integer number (61057995).

Almost surely, 2^122115989 is an apocalyptic number.

It is an amenable number.

122115989 is a deficient number, since it is larger than the sum of its proper divisors (1).

122115989 is an equidigital number, since it uses as much as digits as its factorization.

122115989 is an evil number, because the sum of its binary digits is even.

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

The square root of 122115989 is about 11050.6103451348. The cubic root of 122115989 is about 496.1246935997.

The spelling of 122115989 in words is "one hundred twenty-two million, one hundred fifteen thousand, nine hundred eighty-nine".