22281555 has 16 divisors (see below), whose sum is σ = 36103680. Its totient is φ = 11732448.

The previous prime is 22281551. The next prime is 22281559. The reversal of 22281555 is 55518222.

It is an interprime number because it is at equal distance from previous prime (22281551) and next prime (22281559).

It is not a de Polignac number, because 22281555 - 2² = 22281551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22281551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8217 + ... + 10586.

It is an arithmetic number, because the mean of its divisors is an integer number (2256480).

Almost surely, 2^22281555 is an apocalyptic number.

22281555 is a deficient number, since it is larger than the sum of its proper divisors (13822125).

22281555 is a wasteful number, since it uses less digits than its factorization.

22281555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18890.

The product of its digits is 8000, while the sum is 30.

The square root of 22281555 is about 4720.3342042699. The cubic root of 22281555 is about 281.3942154213.

Adding to 22281555 its reverse (55518222), we get a palindrome (77799777).

The spelling of 22281555 in words is "twenty-two million, two hundred eighty-one thousand, five hundred fifty-five".