31301120209 has 2 divisors, whose sum is σ = 31301120210. Its totient is φ = 31301120208.

The previous prime is 31301120189. The next prime is 31301120231. The reversal of 31301120209 is 90202110313.

It is an a-pointer prime, because the next prime (31301120231) can be obtained adding 31301120209 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31248339984 + 52780225 = 176772^2 + 7265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31301120209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31301120209.

It is not a weakly prime, because it can be changed into another prime (31301124209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650560104 + 15650560105.

It is an arithmetic number, because the mean of its divisors is an integer number (15650560105).

Almost surely, 2^31301120209 is an apocalyptic number.

It is an amenable number.

31301120209 is a deficient number, since it is larger than the sum of its proper divisors (1).

31301120209 is an equidigital number, since it uses as much as digits as its factorization.

31301120209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 31301120209 in words is "thirty-one billion, three hundred one million, one hundred twenty thousand, two hundred nine".