27491231 has 2 divisors, whose sum is σ = 27491232. Its totient is φ = 27491230.

The previous prime is 27491209. The next prime is 27491249. The reversal of 27491231 is 13219472.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27491231 is a prime.

It is a super-2 number, since 2×27491231² = 1511535563790722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27491194 and 27491203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27491201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13745615 + 13745616.

It is an arithmetic number, because the mean of its divisors is an integer number (13745616).

Almost surely, 2^27491231 is an apocalyptic number.

27491231 is a deficient number, since it is larger than the sum of its proper divisors (1).

27491231 is an equidigital number, since it uses as much as digits as its factorization.

27491231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 27491231 is about 5243.2080828439. The cubic root of 27491231 is about 301.8084505241.

The spelling of 27491231 in words is "twenty-seven million, four hundred ninety-one thousand, two hundred thirty-one".