31121412109 has 2 divisors, whose sum is σ = 31121412110. Its totient is φ = 31121412108.

The previous prime is 31121412073. The next prime is 31121412143. The reversal of 31121412109 is 90121412113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29761425225 + 1359986884 = 172515^2 + 36878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121412109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121412149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560706054 + 15560706055.

It is an arithmetic number, because the mean of its divisors is an integer number (15560706055).

Almost surely, 2^31121412109 is an apocalyptic number.

It is an amenable number.

31121412109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121412109 is an equidigital number, since it uses as much as digits as its factorization.

31121412109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

It can be divided in two parts, 311214 and 12109, that added together give a palindrome (323323).

The spelling of 31121412109 in words is "thirty-one billion, one hundred twenty-one million, four hundred twelve thousand, one hundred nine".