16001247 has 4 divisors (see below), whose sum is σ = 21335000. Its totient is φ = 10667496.

The previous prime is 16001231. The next prime is 16001269. The reversal of 16001247 is 74210061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74210061 = 3 ⋅24736687.

It is not a de Polignac number, because 16001247 - 2⁴ = 16001231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2666872 + ... + 2666877.

It is an arithmetic number, because the mean of its divisors is an integer number (5333750).

Almost surely, 2^16001247 is an apocalyptic number.

16001247 is a deficient number, since it is larger than the sum of its proper divisors (5333753).

16001247 is an equidigital number, since it uses as much as digits as its factorization.

16001247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5333752.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 16001247 is about 4000.1558719630. The cubic root of 16001247 is about 251.9907561487.

The spelling of 16001247 in words is "sixteen million, one thousand, two hundred forty-seven".