122139289 has 2 divisors, whose sum is σ = 122139290. Its totient is φ = 122139288.

The previous prime is 122139253. The next prime is 122139313. The reversal of 122139289 is 982931221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119180889 + 2958400 = 10917^2 + 1720^2 .

It is an emirp because it is prime and its reverse (982931221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122139289 - 2¹⁹ = 121615001 is a prime.

It is not a weakly prime, because it can be changed into another prime (122139389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61069644 + 61069645.

It is an arithmetic number, because the mean of its divisors is an integer number (61069645).

Almost surely, 2^122139289 is an apocalyptic number.

It is an amenable number.

122139289 is a deficient number, since it is larger than the sum of its proper divisors (1).

122139289 is an equidigital number, since it uses as much as digits as its factorization.

122139289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 122139289 is about 11051.6645352635. The cubic root of 122139289 is about 496.1562454883.

The spelling of 122139289 in words is "one hundred twenty-two million, one hundred thirty-nine thousand, two hundred eighty-nine".