122031209 has 2 divisors, whose sum is σ = 122031210. Its totient is φ = 122031208.

The previous prime is 122031199. The next prime is 122031229. The reversal of 122031209 is 902130221.

It is an a-pointer prime, because the next prime (122031229) can be obtained adding 122031209 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117787609 + 4243600 = 10853^2 + 2060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122031209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (122031229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61015604 + 61015605.

It is an arithmetic number, because the mean of its divisors is an integer number (61015605).

Almost surely, 2^122031209 is an apocalyptic number.

It is an amenable number.

122031209 is a deficient number, since it is larger than the sum of its proper divisors (1).

122031209 is an equidigital number, since it uses as much as digits as its factorization.

122031209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 122031209 is about 11046.7736918976. The cubic root of 122031209 is about 496.0098541768.

The spelling of 122031209 in words is "one hundred twenty-two million, thirty-one thousand, two hundred nine".