31231031111011 has 2 divisors, whose sum is σ = 31231031111012. Its totient is φ = 31231031111010.

The previous prime is 31231031110963. The next prime is 31231031111029. The reversal of 31231031111011 is 11011113013213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31231031111011 - 2²⁷ = 31230896893283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31231031111011.

It is not a weakly prime, because it can be changed into another prime (31231031111311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615515555505 + 15615515555506.

It is an arithmetic number, because the mean of its divisors is an integer number (15615515555506).

Almost surely, 2^{31231031111011} is an apocalyptic number.

31231031111011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231031111011 is an equidigital number, since it uses as much as digits as its factorization.

31231031111011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 19.

Adding to 31231031111011 its reverse (11011113013213), we get a palindrome (42242144124224).

The spelling of 31231031111011 in words is "thirty-one trillion, two hundred thirty-one billion, thirty-one million, one hundred eleven thousand, eleven".