31315972249 has 2 divisors, whose sum is σ = 31315972250. Its totient is φ = 31315972248.

The previous prime is 31315972229. The next prime is 31315972267. The reversal of 31315972249 is 94227951313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20258398224 + 11057574025 = 142332^2 + 105155^2 .

It is a cyclic number.

It is not a de Polignac number, because 31315972249 - 2¹⁷ = 31315841177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31315972199 and 31315972208.

It is not a weakly prime, because it can be changed into another prime (31315972229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657986124 + 15657986125.

It is an arithmetic number, because the mean of its divisors is an integer number (15657986125).

Almost surely, 2^31315972249 is an apocalyptic number.

It is an amenable number.

31315972249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31315972249 is an equidigital number, since it uses as much as digits as its factorization.

31315972249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The spelling of 31315972249 in words is "thirty-one billion, three hundred fifteen million, nine hundred seventy-two thousand, two hundred forty-nine".