22550729 has 4 divisors (see below), whose sum is σ = 22580676. Its totient is φ = 22520784.

The previous prime is 22550707. The next prime is 22550743. The reversal of 22550729 is 92705522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1638400 + 20912329 = 1280^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 22550729 - 2¹² = 22546633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22550695 and 22550704.

It is not an unprimeable number, because it can be changed into a prime (22559729) 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, 13814 + ... + 15359.

It is an arithmetic number, because the mean of its divisors is an integer number (5645169).

Almost surely, 2^22550729 is an apocalyptic number.

It is an amenable number.

22550729 is a deficient number, since it is larger than the sum of its proper divisors (29947).

22550729 is an equidigital number, since it uses as much as digits as its factorization.

22550729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29946.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 22550729 is about 4748.7607857208. The cubic root of 22550729 is about 282.5228174850.

The spelling of 22550729 in words is "twenty-two million, five hundred fifty thousand, seven hundred twenty-nine".