16218249 has 4 divisors (see below), whose sum is σ = 21624336. Its totient is φ = 10812164.

The previous prime is 16218227. The next prime is 16218259. The reversal of 16218249 is 94281261.

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.

It is a cyclic number.

It is not a de Polignac number, because 16218249 - 2⁵ = 16218217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16218259) 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, 2703039 + ... + 2703044.

It is an arithmetic number, because the mean of its divisors is an integer number (5406084).

Almost surely, 2^16218249 is an apocalyptic number.

It is an amenable number.

16218249 is a deficient number, since it is larger than the sum of its proper divisors (5406087).

16218249 is an equidigital number, since it uses as much as digits as its factorization.

16218249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406086.

The product of its digits is 6912, while the sum is 33.

The square root of 16218249 is about 4027.1887216767. The cubic root of 16218249 is about 253.1247750646.

It can be divided in two parts, 1621 and 8249, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 16218249 in words is "sixteen million, two hundred eighteen thousand, two hundred forty-nine".