31347747817 has 2 divisors, whose sum is σ = 31347747818. Its totient is φ = 31347747816.

The previous prime is 31347747757. The next prime is 31347747869. The reversal of 31347747817 is 71874774313.

It is an a-pointer prime, because the next prime (31347747869) can be obtained adding 31347747817 to its sum of digits (52).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23821144281 + 7526603536 = 154341^2 + 86756^2 .

It is a cyclic number.

It is not a de Polignac number, because 31347747817 - 2⁷ = 31347747689 is a prime.

It is not a weakly prime, because it can be changed into another prime (31347747517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15673873908 + 15673873909.

It is an arithmetic number, because the mean of its divisors is an integer number (15673873909).

Almost surely, 2^31347747817 is an apocalyptic number.

It is an amenable number.

31347747817 is a deficient number, since it is larger than the sum of its proper divisors (1).

31347747817 is an equidigital number, since it uses as much as digits as its factorization.

31347747817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 52.

The spelling of 31347747817 in words is "thirty-one billion, three hundred forty-seven million, seven hundred forty-seven thousand, eight hundred seventeen".