27891553 has 2 divisors, whose sum is σ = 27891554. Its totient is φ = 27891552.

The previous prime is 27891551. The next prime is 27891559. The reversal of 27891553 is 35519872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26296384 + 1595169 = 5128^2 + 1263^2 .

It is a cyclic number.

It is not a de Polignac number, because 27891553 - 2¹ = 27891551 is a prime.

Together with 27891551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27891551) 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, 13945776 + 13945777.

It is an arithmetic number, because the mean of its divisors is an integer number (13945777).

Almost surely, 2^27891553 is an apocalyptic number.

It is an amenable number.

27891553 is a deficient number, since it is larger than the sum of its proper divisors (1).

27891553 is an equidigital number, since it uses as much as digits as its factorization.

27891553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 27891553 is about 5281.2454023649. The cubic root of 27891553 is about 303.2663554839.

The spelling of 27891553 in words is "twenty-seven million, eight hundred ninety-one thousand, five hundred fifty-three".