31111231243 has 2 divisors, whose sum is σ = 31111231244. Its totient is φ = 31111231242.

The previous prime is 31111231189. The next prime is 31111231253. The reversal of 31111231243 is 34213211113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31111231243 - 2²⁵ = 31077676811 is a prime.

It is not a weakly prime, because it can be changed into another prime (31111231253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555615621 + 15555615622.

It is an arithmetic number, because the mean of its divisors is an integer number (15555615622).

Almost surely, 2^31111231243 is an apocalyptic number.

31111231243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111231243 is an equidigital number, since it uses as much as digits as its factorization.

31111231243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

Adding to 31111231243 its reverse (34213211113), we get a palindrome (65324442356).

The spelling of 31111231243 in words is "thirty-one billion, one hundred eleven million, two hundred thirty-one thousand, two hundred forty-three".