31297184249 has 2 divisors, whose sum is σ = 31297184250. Its totient is φ = 31297184248.

The previous prime is 31297184213. The next prime is 31297184287. The reversal of 31297184249 is 94248179213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29778679225 + 1518505024 = 172565^2 + 38968^2 .

It is a cyclic number.

It is not a de Polignac number, because 31297184249 - 2⁸ = 31297183993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31297184197 and 31297184206.

It is not a weakly prime, because it can be changed into another prime (31297184299) 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, 15648592124 + 15648592125.

It is an arithmetic number, because the mean of its divisors is an integer number (15648592125).

Almost surely, 2^31297184249 is an apocalyptic number.

It is an amenable number.

31297184249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31297184249 is an equidigital number, since it uses as much as digits as its factorization.

31297184249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The spelling of 31297184249 in words is "thirty-one billion, two hundred ninety-seven million, one hundred eighty-four thousand, two hundred forty-nine".