16251 has 4 divisors (see below), whose sum is σ = 21672. Its totient is φ = 10832.

The previous prime is 16249. The next prime is 16253. The reversal of 16251 is 15261.

16251 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15261 = 3 ⋅5087.

It is an interprime number because it is at equal distance from previous prime (16249) and next prime (16253).

It is a cyclic number.

It is not a de Polignac number, because 16251 - 2¹ = 16249 is a prime.

It is a D-number.

It is a plaindrome in base 11.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 16251.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 16251.

It is not an unprimeable number, because it can be changed into a prime (16253) 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, 2706 + ... + 2711.

It is an arithmetic number, because the mean of its divisors is an integer number (5418).

2¹⁶²⁵¹ is an apocalyptic number.

16251 is a deficient number, since it is larger than the sum of its proper divisors (5421).

16251 is an equidigital number, since it uses as much as digits as its factorization.

16251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5420.

The product of its digits is 60, while the sum is 15.

The square root of 16251 is about 127.4794101022. The cubic root of 16251 is about 25.3295046538.

Subtracting from 16251 its reverse (15261), we obtain a triangular number (990 = T₄₄).

The spelling of 16251 in words is "sixteen thousand, two hundred fifty-one".