27218869 has 2 divisors, whose sum is σ = 27218870. Its totient is φ = 27218868.

The previous prime is 27218861. The next prime is 27218903. The reversal of 27218869 is 96881272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26780625 + 438244 = 5175^2 + 662^2 .

It is a cyclic number.

It is not a de Polignac number, because 27218869 - 2³ = 27218861 is a prime.

It is a super-2 number, since 2×27218869² = 1481733659278322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27218861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13609434 + 13609435.

It is an arithmetic number, because the mean of its divisors is an integer number (13609435).

Almost surely, 2^27218869 is an apocalyptic number.

It is an amenable number.

27218869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27218869 is an equidigital number, since it uses as much as digits as its factorization.

27218869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 27218869 is about 5217.1705933389. The cubic root of 27218869 is about 300.8084453560.

The spelling of 27218869 in words is "twenty-seven million, two hundred eighteen thousand, eight hundred sixty-nine".