16651387 has 2 divisors, whose sum is σ = 16651388. Its totient is φ = 16651386.

The previous prime is 16651357. The next prime is 16651399. The reversal of 16651387 is 78315661.

It is a strong prime.

It is an emirp because it is prime and its reverse (78315661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16651387 - 2⁷ = 16651259 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16651337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8325693 + 8325694.

It is an arithmetic number, because the mean of its divisors is an integer number (8325694).

Almost surely, 2^16651387 is an apocalyptic number.

16651387 is a deficient number, since it is larger than the sum of its proper divisors (1).

16651387 is an equidigital number, since it uses as much as digits as its factorization.

16651387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 16651387 is about 4080.6111061948. The cubic root of 16651387 is about 255.3583939132.

The spelling of 16651387 in words is "sixteen million, six hundred fifty-one thousand, three hundred eighty-seven".