19678313 has 2 divisors, whose sum is σ = 19678314. Its totient is φ = 19678312.

The previous prime is 19678301. The next prime is 19678331. The reversal of 19678313 is 31387691.

19678313 is nontrivially palindromic in base 2.

Together with next prime (19678331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 946729 = 4328^2 + 973^2 .

It is a cyclic number.

It is not a de Polignac number, because 19678313 - 2⁴ = 19678297 is a prime.

It is not a weakly prime, because it can be changed into another prime (19678013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9839156 + 9839157.

It is an arithmetic number, because the mean of its divisors is an integer number (9839157).

Almost surely, 2^19678313 is an apocalyptic number.

It is an amenable number.

19678313 is a deficient number, since it is larger than the sum of its proper divisors (1).

19678313 is an equidigital number, since it uses as much as digits as its factorization.

19678313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 19678313 is about 4436.0244589046. The cubic root of 19678313 is about 269.9785671144.

It can be divided in two parts, 19678 and 313, that added together give a palindrome (19991).

The spelling of 19678313 in words is "nineteen million, six hundred seventy-eight thousand, three hundred thirteen".