31111213193 has 2 divisors, whose sum is σ = 31111213194. Its totient is φ = 31111213192.

The previous prime is 31111213181. The next prime is 31111213249. The reversal of 31111213193 is 39131211113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17447239744 + 13663973449 = 132088^2 + 116893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31111213193 is a prime.

It is not a weakly prime, because it can be changed into another prime (31111213153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555606596 + 15555606597.

It is an arithmetic number, because the mean of its divisors is an integer number (15555606597).

Almost surely, 2^31111213193 is an apocalyptic number.

It is an amenable number.

31111213193 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111213193 is an equidigital number, since it uses as much as digits as its factorization.

31111213193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 26.

The spelling of 31111213193 in words is "thirty-one billion, one hundred eleven million, two hundred thirteen thousand, one hundred ninety-three".