22557287 has 2 divisors, whose sum is σ = 22557288. Its totient is φ = 22557286.

The previous prime is 22557263. The next prime is 22557299. The reversal of 22557287 is 78275522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22557287 - 2¹² = 22553191 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22557287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22587287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11278643 + 11278644.

It is an arithmetic number, because the mean of its divisors is an integer number (11278644).

Almost surely, 2^22557287 is an apocalyptic number.

22557287 is a deficient number, since it is larger than the sum of its proper divisors (1).

22557287 is an equidigital number, since it uses as much as digits as its factorization.

22557287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78400, while the sum is 38.

The square root of 22557287 is about 4749.4512314582. The cubic root of 22557287 is about 282.5502017448.

The spelling of 22557287 in words is "twenty-two million, five hundred fifty-seven thousand, two hundred eighty-seven".