27155813 has 2 divisors, whose sum is σ = 27155814. Its totient is φ = 27155812.

The previous prime is 27155771. The next prime is 27155827. The reversal of 27155813 is 31855172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25573249 + 1582564 = 5057^2 + 1258^2 .

It is a cyclic number.

It is not a de Polignac number, because 27155813 - 2²⁴ = 10378597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27155813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27155113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13577906 + 13577907.

It is an arithmetic number, because the mean of its divisors is an integer number (13577907).

Almost surely, 2^27155813 is an apocalyptic number.

It is an amenable number.

27155813 is a deficient number, since it is larger than the sum of its proper divisors (1).

27155813 is an equidigital number, since it uses as much as digits as its factorization.

27155813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 32.

The square root of 27155813 is about 5211.1239670536. The cubic root of 27155813 is about 300.5759786395.

The spelling of 27155813 in words is "twenty-seven million, one hundred fifty-five thousand, eight hundred thirteen".