27245821 has 2 divisors, whose sum is σ = 27245822. Its totient is φ = 27245820.

The previous prime is 27245809. The next prime is 27245831. The reversal of 27245821 is 12854272.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27185796 + 60025 = 5214^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 27245821 - 2¹¹ = 27243773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27245831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13622910 + 13622911.

It is an arithmetic number, because the mean of its divisors is an integer number (13622911).

Almost surely, 2^27245821 is an apocalyptic number.

It is an amenable number.

27245821 is a deficient number, since it is larger than the sum of its proper divisors (1).

27245821 is an equidigital number, since it uses as much as digits as its factorization.

27245821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 31.

The square root of 27245821 is about 5219.7529635032. The cubic root of 27245821 is about 300.9076989868.

The spelling of 27245821 in words is "twenty-seven million, two hundred forty-five thousand, eight hundred twenty-one".