16013281 has 4 divisors (see below), whose sum is σ = 16074432. Its totient is φ = 15952132.

The previous prime is 16013279. The next prime is 16013287. The reversal of 16013281 is 18231061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18231061 = 163 ⋅111847.

It is a cyclic number.

It is not a de Polignac number, because 16013281 - 2¹ = 16013279 is a prime.

It is a super-2 number, since 2×16013281² = 512850336769922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16013287) 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, 30181 + ... + 30706.

It is an arithmetic number, because the mean of its divisors is an integer number (4018608).

Almost surely, 2^16013281 is an apocalyptic number.

It is an amenable number.

16013281 is a deficient number, since it is larger than the sum of its proper divisors (61151).

16013281 is an equidigital number, since it uses as much as digits as its factorization.

16013281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61150.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 16013281 is about 4001.6597806410. The cubic root of 16013281 is about 252.0539115781.

The spelling of 16013281 in words is "sixteen million, thirteen thousand, two hundred eighty-one".