22499 has 4 divisors (see below), whose sum is σ = 22800. Its totient is φ = 22200.

The previous prime is 22483. The next prime is 22501. The reversal of 22499 is 99422.

It is a Cunningham number, because it is equal to 150²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99422 = 2 ⋅49711.

It is a cyclic number.

It is not a de Polignac number, because 22499 - 2⁴ = 22483 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10 and base 15.

It is not an unprimeable number, because it can be changed into a prime (22409) 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, 74 + ... + 224.

It is an arithmetic number, because the mean of its divisors is an integer number (5700).

2²²⁴⁹⁹ is an apocalyptic number.

22499 is a deficient number, since it is larger than the sum of its proper divisors (301).

22499 is a wasteful number, since it uses less digits than its factorization.

22499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its digits is 1296, while the sum is 26.

The square root of 22499 is about 149.9966666296. The cubic root of 22499 is about 28.2306626220.

It can be divided in two parts, 224 and 99, that added together give a palindrome (323).

The spelling of 22499 in words is "twenty-two thousand, four hundred ninety-nine".