27791123 has 2 divisors, whose sum is σ = 27791124. Its totient is φ = 27791122.

The previous prime is 27791117. The next prime is 27791143. The reversal of 27791123 is 32119772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27791123 - 2¹⁶ = 27725587 is a prime.

It is a super-2 number, since 2×27791123² = 1544693035202258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27791123.

It is not a weakly prime, because it can be changed into another prime (27791143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13895561 + 13895562.

It is an arithmetic number, because the mean of its divisors is an integer number (13895562).

Almost surely, 2^27791123 is an apocalyptic number.

27791123 is a deficient number, since it is larger than the sum of its proper divisors (1).

27791123 is an equidigital number, since it uses as much as digits as its factorization.

27791123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 32.

The square root of 27791123 is about 5271.7286538668. The cubic root of 27791123 is about 302.9019241301.

The spelling of 27791123 in words is "twenty-seven million, seven hundred ninety-one thousand, one hundred twenty-three".