111031131209 has 2 divisors, whose sum is σ = 111031131210. Its totient is φ = 111031131208.

The previous prime is 111031131199. The next prime is 111031131227. The reversal of 111031131209 is 902131130111.

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., 106158672400 + 4872458809 = 325820^2 + 69803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111031131209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (111031139209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55515565604 + 55515565605.

It is an arithmetic number, because the mean of its divisors is an integer number (55515565605).

Almost surely, 2^111031131209 is an apocalyptic number.

It is an amenable number.

111031131209 is a deficient number, since it is larger than the sum of its proper divisors (1).

111031131209 is an equidigital number, since it uses as much as digits as its factorization.

111031131209 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 111031131209 in words is "one hundred eleven billion, thirty-one million, one hundred thirty-one thousand, two hundred nine".