16381247 has 2 divisors, whose sum is σ = 16381248. Its totient is φ = 16381246.

The previous prime is 16381241. The next prime is 16381279. The reversal of 16381247 is 74218361.

It is an a-pointer prime, because the next prime (16381279) can be obtained adding 16381247 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16381247 - 2⁴ = 16381231 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16381241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8190623 + 8190624.

It is an arithmetic number, because the mean of its divisors is an integer number (8190624).

Almost surely, 2^16381247 is an apocalyptic number.

16381247 is a deficient number, since it is larger than the sum of its proper divisors (1).

16381247 is an equidigital number, since it uses as much as digits as its factorization.

16381247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 16381247 is about 4047.3753223540. The cubic root of 16381247 is about 253.9699418830.

The spelling of 16381247 in words is "sixteen million, three hundred eighty-one thousand, two hundred forty-seven".