17312381 has 2 divisors, whose sum is σ = 17312382. Its totient is φ = 17312380.

The previous prime is 17312377. The next prime is 17312387. The reversal of 17312381 is 18321371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15476356 + 1836025 = 3934^2 + 1355^2 .

It is an emirp because it is prime and its reverse (18321371) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17312381 - 2² = 17312377 is a prime.

It is a super-2 number, since 2×17312381² = 599437071778322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 17312381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17312387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8656190 + 8656191.

It is an arithmetic number, because the mean of its divisors is an integer number (8656191).

Almost surely, 2^17312381 is an apocalyptic number.

It is an amenable number.

17312381 is a deficient number, since it is larger than the sum of its proper divisors (1).

17312381 is an equidigital number, since it uses as much as digits as its factorization.

17312381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 17312381 is about 4160.8149442147. The cubic root of 17312381 is about 258.6935498845.

The spelling of 17312381 in words is "seventeen million, three hundred twelve thousand, three hundred eighty-one".