122931209 has 2 divisors, whose sum is σ = 122931210. Its totient is φ = 122931208.

The previous prime is 122931187. The next prime is 122931223. The reversal of 122931209 is 902139221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96098809 + 26832400 = 9803^2 + 5180^2 .

It is a cyclic number.

It is not a de Polignac number, because 122931209 - 2¹² = 122927113 is a prime.

It is a super-2 number, since 2×122931209² = 30224164292403362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (122931269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61465604 + 61465605.

It is an arithmetic number, because the mean of its divisors is an integer number (61465605).

Almost surely, 2^122931209 is an apocalyptic number.

It is an amenable number.

122931209 is a deficient number, since it is larger than the sum of its proper divisors (1).

122931209 is an equidigital number, since it uses as much as digits as its factorization.

122931209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 122931209 is about 11087.4347348699. The cubic root of 122931209 is about 497.2262531101.

The spelling of 122931209 in words is "one hundred twenty-two million, nine hundred thirty-one thousand, two hundred nine".