31001111012309 has 2 divisors, whose sum is σ = 31001111012310. Its totient is φ = 31001111012308.

The previous prime is 31001111012299. The next prime is 31001111012321. The reversal of 31001111012309 is 90321011110013.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20400551789809 + 10600559222500 = 4516697^2 + 3255850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31001111012309 is a prime.

It is a super-2 number, since 2×31001111012309² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31001111014309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500555506154 + 15500555506155.

It is an arithmetic number, because the mean of its divisors is an integer number (15500555506155).

Almost surely, 2^{31001111012309} is an apocalyptic number.

It is an amenable number.

31001111012309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31001111012309 is an equidigital number, since it uses as much as digits as its factorization.

31001111012309 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 23.

The spelling of 31001111012309 in words is "thirty-one trillion, one billion, one hundred eleven million, twelve thousand, three hundred nine".