31121444311 has 2 divisors, whose sum is σ = 31121444312. Its totient is φ = 31121444310.

The previous prime is 31121444303. The next prime is 31121444399. The reversal of 31121444311 is 11344412113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31121444311 - 2³ = 31121444303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121444411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560722155 + 15560722156.

It is an arithmetic number, because the mean of its divisors is an integer number (15560722156).

Almost surely, 2^31121444311 is an apocalyptic number.

31121444311 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121444311 is an equidigital number, since it uses as much as digits as its factorization.

31121444311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

Adding to 31121444311 its reverse (11344412113), we get a palindrome (42465856424).

The spelling of 31121444311 in words is "thirty-one billion, one hundred twenty-one million, four hundred forty-four thousand, three hundred eleven".