22149815 has 4 divisors (see below), whose sum is σ = 26579784. Its totient is φ = 17719848.

The previous prime is 22149811. The next prime is 22149833. The reversal of 22149815 is 51894122.

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 22149815 - 2² = 22149811 is a prime.

It is a super-2 number, since 2×22149815² = 981228609068450, 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 (22149811) 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, 2214977 + ... + 2214986.

It is an arithmetic number, because the mean of its divisors is an integer number (6644946).

Almost surely, 2^22149815 is an apocalyptic number.

22149815 is a deficient number, since it is larger than the sum of its proper divisors (4429969).

22149815 is an equidigital number, since it uses as much as digits as its factorization.

22149815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429968.

The product of its digits is 5760, while the sum is 32.

The square root of 22149815 is about 4706.3589960818. The cubic root of 22149815 is about 280.8385364369.

The spelling of 22149815 in words is "twenty-two million, one hundred forty-nine thousand, eight hundred fifteen".