31284447317 has 2 divisors, whose sum is σ = 31284447318. Its totient is φ = 31284447316.

The previous prime is 31284447301. The next prime is 31284447331. The reversal of 31284447317 is 71374448213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16206817636 + 15077629681 = 127306^2 + 122791^2 .

It is a cyclic number.

It is not a de Polignac number, because 31284447317 - 2⁴ = 31284447301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31284447367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15642223658 + 15642223659.

It is an arithmetic number, because the mean of its divisors is an integer number (15642223659).

Almost surely, 2^31284447317 is an apocalyptic number.

It is an amenable number.

31284447317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31284447317 is an equidigital number, since it uses as much as digits as its factorization.

31284447317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 44.

The spelling of 31284447317 in words is "thirty-one billion, two hundred eighty-four million, four hundred forty-seven thousand, three hundred seventeen".