27197791 has 2 divisors, whose sum is σ = 27197792. Its totient is φ = 27197790.

The previous prime is 27197767. The next prime is 27197803. The reversal of 27197791 is 19779172.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27197791 - 2⁷ = 27197663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27197491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13598895 + 13598896.

It is an arithmetic number, because the mean of its divisors is an integer number (13598896).

Almost surely, 2^27197791 is an apocalyptic number.

27197791 is a deficient number, since it is larger than the sum of its proper divisors (1).

27197791 is an equidigital number, since it uses as much as digits as its factorization.

27197791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55566, while the sum is 43.

The square root of 27197791 is about 5215.1501416546. The cubic root of 27197791 is about 300.7307776937.

The spelling of 27197791 in words is "twenty-seven million, one hundred ninety-seven thousand, seven hundred ninety-one".