31121303149 has 2 divisors, whose sum is σ = 31121303150. Its totient is φ = 31121303148.

The previous prime is 31121303119. The next prime is 31121303153. The reversal of 31121303149 is 94130312113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21876480649 + 9244822500 = 147907^2 + 96150^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121303149 - 2⁷ = 31121303021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121303119) 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, 15560651574 + 15560651575.

It is an arithmetic number, because the mean of its divisors is an integer number (15560651575).

Almost surely, 2^31121303149 is an apocalyptic number.

It is an amenable number.

31121303149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121303149 is an equidigital number, since it uses as much as digits as its factorization.

31121303149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 31121303149 in words is "thirty-one billion, one hundred twenty-one million, three hundred three thousand, one hundred forty-nine".