27091231 has 2 divisors, whose sum is σ = 27091232. Its totient is φ = 27091230.

The previous prime is 27091213. The next prime is 27091237. The reversal of 27091231 is 13219072.

Together with previous prime (27091213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27091231 - 2¹⁵ = 27058463 is a prime.

It is a super-2 number, since 2×27091231² = 1467869594190722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27091196 and 27091205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27091237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13545615 + 13545616.

It is an arithmetic number, because the mean of its divisors is an integer number (13545616).

Almost surely, 2^27091231 is an apocalyptic number.

27091231 is a deficient number, since it is larger than the sum of its proper divisors (1).

27091231 is an equidigital number, since it uses as much as digits as its factorization.

27091231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 27091231 is about 5204.9237266265. The cubic root of 27091231 is about 300.3375127340.

The spelling of 27091231 in words is "twenty-seven million, ninety-one thousand, two hundred thirty-one".