16878613 has 2 divisors, whose sum is σ = 16878614. Its totient is φ = 16878612.

The previous prime is 16878611. The next prime is 16878649. The reversal of 16878613 is 31687861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9381969 + 7496644 = 3063^2 + 2738^2 .

It is a cyclic number.

It is not a de Polignac number, because 16878613 - 2¹ = 16878611 is a prime.

Together with 16878611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16878611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8439306 + 8439307.

It is an arithmetic number, because the mean of its divisors is an integer number (8439307).

Almost surely, 2^16878613 is an apocalyptic number.

It is an amenable number.

16878613 is a deficient number, since it is larger than the sum of its proper divisors (1).

16878613 is an equidigital number, since it uses as much as digits as its factorization.

16878613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 16878613 is about 4108.3589181083. The cubic root of 16878613 is about 256.5146963044.

The spelling of 16878613 in words is "sixteen million, eight hundred seventy-eight thousand, six hundred thirteen".