31917398329 has 2 divisors, whose sum is σ = 31917398330. Its totient is φ = 31917398328.

The previous prime is 31917398269. The next prime is 31917398341. The reversal of 31917398329 is 92389371913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23370765625 + 8546632704 = 152875^2 + 92448^2 .

It is a cyclic number.

It is not a de Polignac number, because 31917398329 - 2¹¹ = 31917396281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31917398329.

It is not a weakly prime, because it can be changed into another prime (31917392329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15958699164 + 15958699165.

It is an arithmetic number, because the mean of its divisors is an integer number (15958699165).

Almost surely, 2^31917398329 is an apocalyptic number.

It is an amenable number.

31917398329 is a deficient number, since it is larger than the sum of its proper divisors (1).

31917398329 is an equidigital number, since it uses as much as digits as its factorization.

31917398329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 55.

The spelling of 31917398329 in words is "thirty-one billion, nine hundred seventeen million, three hundred ninety-eight thousand, three hundred twenty-nine".