31111101101309 has 2 divisors, whose sum is σ = 31111101101310. Its totient is φ = 31111101101308.

The previous prime is 31111101101299. The next prime is 31111101101321. The reversal of 31111101101309 is 90310110111113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28194007898809 + 2917093202500 = 5309803^2 + 1707950^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111101101309 - 2²⁰ = 31111100052733 is a prime.

It is a super-2 number, since 2×31111101101309² (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 (31111101101389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555550550654 + 15555550550655.

It is an arithmetic number, because the mean of its divisors is an integer number (15555550550655).

Almost surely, 2^{31111101101309} is an apocalyptic number.

It is an amenable number.

31111101101309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111101101309 is an equidigital number, since it uses as much as digits as its factorization.

31111101101309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 23.

The spelling of 31111101101309 in words is "thirty-one trillion, one hundred eleven billion, one hundred one million, one hundred one thousand, three hundred nine".