18416971 has 2 divisors, whose sum is σ = 18416972. Its totient is φ = 18416970.

The previous prime is 18416969. The next prime is 18416977. The reversal of 18416971 is 17961481.

It is a weak prime.

It is an emirp because it is prime and its reverse (17961481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18416971 - 2¹ = 18416969 is a prime.

Together with 18416969, it forms a pair of twin primes.

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 18416971.

It is not a weakly prime, because it can be changed into another prime (18416977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208485 + 9208486.

It is an arithmetic number, because the mean of its divisors is an integer number (9208486).

Almost surely, 2^18416971 is an apocalyptic number.

18416971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18416971 is an equidigital number, since it uses as much as digits as its factorization.

18416971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 18416971 is about 4291.4998543633. The cubic root of 18416971 is about 264.0823654464.

The spelling of 18416971 in words is "eighteen million, four hundred sixteen thousand, nine hundred seventy-one".