31340317 has 2 divisors, whose sum is σ = 31340318. Its totient is φ = 31340316.

The previous prime is 31340303. The next prime is 31340381. The reversal of 31340317 is 71304313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22982436 + 8357881 = 4794^2 + 2891^2 .

It is an emirp because it is prime and its reverse (71304313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31340317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31340417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15670158 + 15670159.

It is an arithmetic number, because the mean of its divisors is an integer number (15670159).

Almost surely, 2^31340317 is an apocalyptic number.

It is an amenable number.

31340317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31340317 is an equidigital number, since it uses as much as digits as its factorization.

31340317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 31340317 is about 5598.2423134409. The cubic root of 31340317 is about 315.2834167131.

The spelling of 31340317 in words is "thirty-one million, three hundred forty thousand, three hundred seventeen".