31211310000109 has 2 divisors, whose sum is σ = 31211310000110. Its totient is φ = 31211310000108.

The previous prime is 31211310000011. The next prime is 31211310000139. The reversal of 31211310000109 is 90100001311213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17247658180900 + 13963651819209 = 4153030^2 + 3736797^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211310000109 - 2⁷ = 31211309999981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31211310000109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31211310000139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605655000054 + 15605655000055.

It is an arithmetic number, because the mean of its divisors is an integer number (15605655000055).

Almost surely, 2^{31211310000109} is an apocalyptic number.

It is an amenable number.

31211310000109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211310000109 is an equidigital number, since it uses as much as digits as its factorization.

31211310000109 is an evil number, because the sum of its binary digits is even.

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

The spelling of 31211310000109 in words is "thirty-one trillion, two hundred eleven billion, three hundred ten million, one hundred nine", and thus it is an aban number.