22615 has 4 divisors (see below), whose sum is σ = 27144.
Its totient is φ = 18088.
The previous prime is 22613. The next prime is 22619. The reversal of 22615 is 51622.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 22615 - 21 = 22613 is a prime.
It is a super-2 number, since 2×226152 = 1022876450, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (22613) 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, 2257 + ... + 2266.
It is an arithmetic number, because the mean of its divisors is an integer number (6786).
222615 is an apocalyptic number.
22615 is a deficient number, since it is larger than the sum of its proper divisors (4529).
22615 is an equidigital number, since it uses as much as digits as its factorization.
22615 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4528.
The product of its digits is 120, while the sum is 16.
The square root of 22615 is about 150.3828447663.
The cubic root of 22615 is about 28.2790965516.
The spelling of 22615 in words is "twenty-two thousand, six hundred fifteen".