22506287 has 2 divisors, whose sum is σ = 22506288. Its totient is φ = 22506286.

The previous prime is 22506277. The next prime is 22506293. The reversal of 22506287 is 78260522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22506287 - 2⁴ = 22506271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22506247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11253143 + 11253144.

It is an arithmetic number, because the mean of its divisors is an integer number (11253144).

Almost surely, 2^22506287 is an apocalyptic number.

22506287 is a deficient number, since it is larger than the sum of its proper divisors (1).

22506287 is an equidigital number, since it uses as much as digits as its factorization.

22506287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 22506287 is about 4744.0791519535. The cubic root of 22506287 is about 282.3371008534.

The spelling of 22506287 in words is "twenty-two million, five hundred six thousand, two hundred eighty-seven".