31111301209 has 2 divisors, whose sum is σ = 31111301210. Its totient is φ = 31111301208.

The previous prime is 31111301189. The next prime is 31111301237. The reversal of 31111301209 is 90210311113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18628155225 + 12483145984 = 136485^2 + 111728^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111301209 - 2²¹ = 31109204057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31111301209.

It is not a weakly prime, because it can be changed into another prime (31111301609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555650604 + 15555650605.

It is an arithmetic number, because the mean of its divisors is an integer number (15555650605).

Almost surely, 2^31111301209 is an apocalyptic number.

It is an amenable number.

31111301209 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111301209 is an equidigital number, since it uses as much as digits as its factorization.

31111301209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The spelling of 31111301209 in words is "thirty-one billion, one hundred eleven million, three hundred one thousand, two hundred nine".