27553381 has 2 divisors, whose sum is σ = 27553382. Its totient is φ = 27553380.

The previous prime is 27553373. The next prime is 27553387. The reversal of 27553381 is 18335572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22752900 + 4800481 = 4770^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 27553381 - 2³ = 27553373 is a prime.

It is a super-2 number, since 2×27553381² = 1518377609062322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27553387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13776690 + 13776691.

It is an arithmetic number, because the mean of its divisors is an integer number (13776691).

Almost surely, 2^27553381 is an apocalyptic number.

It is an amenable number.

27553381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27553381 is an equidigital number, since it uses as much as digits as its factorization.

27553381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 27553381 is about 5249.1314519642. The cubic root of 27553381 is about 302.0357142389.

The spelling of 27553381 in words is "twenty-seven million, five hundred fifty-three thousand, three hundred eighty-one".