22299681 has 4 divisors (see below), whose sum is σ = 29732912. Its totient is φ = 14866452.

The previous prime is 22299649. The next prime is 22299691. The reversal of 22299681 is 18699222.

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 not a de Polignac number, because 22299681 - 2⁵ = 22299649 is a prime.

It is a super-3 number, since 3×22299681³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22299601) 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, 3716611 + ... + 3716616.

It is an arithmetic number, because the mean of its divisors is an integer number (7433228).

Almost surely, 2^22299681 is an apocalyptic number.

It is an amenable number.

22299681 is a deficient number, since it is larger than the sum of its proper divisors (7433231).

22299681 is an equidigital number, since it uses as much as digits as its factorization.

22299681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7433230.

The product of its digits is 31104, while the sum is 39.

The square root of 22299681 is about 4722.2538051231. The cubic root of 22299681 is about 281.4704992815.

The spelling of 22299681 in words is "twenty-two million, two hundred ninety-nine thousand, six hundred eighty-one".