27265813 has 2 divisors, whose sum is σ = 27265814. Its totient is φ = 27265812.

The previous prime is 27265793. The next prime is 27265831. The reversal of 27265813 is 31856272.

It is a happy number.

Together with next prime (27265831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19554084 + 7711729 = 4422^2 + 2777^2 .

It is a cyclic number.

It is not a de Polignac number, because 27265813 - 2¹⁷ = 27134741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27265853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13632906 + 13632907.

It is an arithmetic number, because the mean of its divisors is an integer number (13632907).

Almost surely, 2^27265813 is an apocalyptic number.

It is an amenable number.

27265813 is a deficient number, since it is larger than the sum of its proper divisors (1).

27265813 is an equidigital number, since it uses as much as digits as its factorization.

27265813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 27265813 is about 5221.6676454941. The cubic root of 27265813 is about 300.9812793955.

It can be divided in two parts, 272 and 65813, that multiplied together give a triangular number (17901136 = T₅₉₈₃).

The spelling of 27265813 in words is "twenty-seven million, two hundred sixty-five thousand, eight hundred thirteen".