31463785817 has 2 divisors, whose sum is σ = 31463785818. Its totient is φ = 31463785816.

The previous prime is 31463785783. The next prime is 31463785849. The reversal of 31463785817 is 71858736413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21680795536 + 9782990281 = 147244^2 + 98909^2 .

It is a cyclic number.

It is not a de Polignac number, because 31463785817 - 2¹⁸ = 31463523673 is a prime.

It is not a weakly prime, because it can be changed into another prime (31463785217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15731892908 + 15731892909.

It is an arithmetic number, because the mean of its divisors is an integer number (15731892909).

Almost surely, 2^31463785817 is an apocalyptic number.

It is an amenable number.

31463785817 is a deficient number, since it is larger than the sum of its proper divisors (1).

31463785817 is an equidigital number, since it uses as much as digits as its factorization.

31463785817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 53.

The spelling of 31463785817 in words is "thirty-one billion, four hundred sixty-three million, seven hundred eighty-five thousand, eight hundred seventeen".