18716671 has 2 divisors, whose sum is σ = 18716672. Its totient is φ = 18716670.

The previous prime is 18716647. The next prime is 18716683. The reversal of 18716671 is 17661781.

It is a strong prime.

It is an emirp because it is prime and its reverse (17661781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18716671 - 2⁵ = 18716639 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18716671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18716171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9358335 + 9358336.

It is an arithmetic number, because the mean of its divisors is an integer number (9358336).

Almost surely, 2^18716671 is an apocalyptic number.

18716671 is a deficient number, since it is larger than the sum of its proper divisors (1).

18716671 is an equidigital number, since it uses as much as digits as its factorization.

18716671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 37.

The square root of 18716671 is about 4326.2768057534. The cubic root of 18716671 is about 265.5071385022.

The spelling of 18716671 in words is "eighteen million, seven hundred sixteen thousand, six hundred seventy-one".