17131993 has 2 divisors, whose sum is σ = 17131994. Its totient is φ = 17131992.

The previous prime is 17131991. The next prime is 17132009. The reversal of 17131993 is 39913171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10413529 + 6718464 = 3227^2 + 2592^2 .

It is an emirp because it is prime and its reverse (39913171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17131993 - 2¹ = 17131991 is a prime.

Together with 17131991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (17131991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8565996 + 8565997.

It is an arithmetic number, because the mean of its divisors is an integer number (8565997).

Almost surely, 2^17131993 is an apocalyptic number.

It is an amenable number.

17131993 is a deficient number, since it is larger than the sum of its proper divisors (1).

17131993 is an equidigital number, since it uses as much as digits as its factorization.

17131993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5103, while the sum is 34.

The square root of 17131993 is about 4139.0811782327. The cubic root of 17131993 is about 257.7919170320.

The spelling of 17131993 in words is "seventeen million, one hundred thirty-one thousand, nine hundred ninety-three".