22666531 has 2 divisors, whose sum is σ = 22666532. Its totient is φ = 22666530.

The previous prime is 22666529. The next prime is 22666541. The reversal of 22666531 is 13566622.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22666531 - 2¹ = 22666529 is a prime.

It is a super-2 number, since 2×22666531² = 1027543255147922, which contains 22 as substring.

Together with 22666529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22666493 and 22666502.

It is not a weakly prime, because it can be changed into another prime (22666541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11333265 + 11333266.

It is an arithmetic number, because the mean of its divisors is an integer number (11333266).

Almost surely, 2^22666531 is an apocalyptic number.

22666531 is a deficient number, since it is larger than the sum of its proper divisors (1).

22666531 is an equidigital number, since it uses as much as digits as its factorization.

22666531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 22666531 is about 4760.9380378241. The cubic root of 22666531 is about 283.0055936664.

Subtracting from 22666531 its reverse (13566622), we obtain a palindrome (9099909).

The spelling of 22666531 in words is "twenty-two million, six hundred sixty-six thousand, five hundred thirty-one".