20220131209 has 2 divisors, whose sum is σ = 20220131210. Its totient is φ = 20220131208.

The previous prime is 20220131203. The next prime is 20220131213. The reversal of 20220131209 is 90213102202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20219986809 + 144400 = 142197^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220131209 - 2¹⁷ = 20220000137 is a prime.

It is a super-2 number, since 2×20220131209² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20220131209.

It is not a weakly prime, because it can be changed into another prime (20220131203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110065604 + 10110065605.

It is an arithmetic number, because the mean of its divisors is an integer number (10110065605).

Almost surely, 2^20220131209 is an apocalyptic number.

It is an amenable number.

20220131209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220131209 is an equidigital number, since it uses as much as digits as its factorization.

20220131209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 20220131209 in words is "twenty billion, two hundred twenty million, one hundred thirty-one thousand, two hundred nine".