31224642209 has 2 divisors, whose sum is σ = 31224642210. Its totient is φ = 31224642208.

The previous prime is 31224642131. The next prime is 31224642233. The reversal of 31224642209 is 90224642213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30675771025 + 548871184 = 175145^2 + 23428^2 .

It is a cyclic number.

It is not a de Polignac number, because 31224642209 - 2¹² = 31224638113 is a prime.

It is not a weakly prime, because it can be changed into another prime (31224642259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612321104 + 15612321105.

It is an arithmetic number, because the mean of its divisors is an integer number (15612321105).

Almost surely, 2^31224642209 is an apocalyptic number.

It is an amenable number.

31224642209 is a deficient number, since it is larger than the sum of its proper divisors (1).

31224642209 is an equidigital number, since it uses as much as digits as its factorization.

31224642209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 31224642209 in words is "thirty-one billion, two hundred twenty-four million, six hundred forty-two thousand, two hundred nine".