22588781 has 2 divisors, whose sum is σ = 22588782. Its totient is φ = 22588780.

The previous prime is 22588771. The next prime is 22588817. The reversal of 22588781 is 18788522.

Together with next prime (22588817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17598025 + 4990756 = 4195^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 22588781 - 2¹⁰ = 22587757 is a prime.

It is a super-2 number, since 2×22588781² = 1020506054131922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22588771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11294390 + 11294391.

It is an arithmetic number, because the mean of its divisors is an integer number (11294391).

Almost surely, 2^22588781 is an apocalyptic number.

It is an amenable number.

22588781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22588781 is an equidigital number, since it uses as much as digits as its factorization.

22588781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71680, while the sum is 41.

The square root of 22588781 is about 4752.7656159335. The cubic root of 22588781 is about 282.6816374371.

The spelling of 22588781 in words is "twenty-two million, five hundred eighty-eight thousand, seven hundred eighty-one".