31854158317 has 2 divisors, whose sum is σ = 31854158318. Its totient is φ = 31854158316.

The previous prime is 31854158311. The next prime is 31854158381. The reversal of 31854158317 is 71385145813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30847301956 + 1006856361 = 175634^2 + 31731^2 .

It is an emirp because it is prime and its reverse (71385145813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31854158317 - 2¹⁵ = 31854125549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31854158311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15927079158 + 15927079159.

It is an arithmetic number, because the mean of its divisors is an integer number (15927079159).

Almost surely, 2^31854158317 is an apocalyptic number.

It is an amenable number.

31854158317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31854158317 is an equidigital number, since it uses as much as digits as its factorization.

31854158317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 46.

The spelling of 31854158317 in words is "thirty-one billion, eight hundred fifty-four million, one hundred fifty-eight thousand, three hundred seventeen".