27691973 has 2 divisors, whose sum is σ = 27691974. Its totient is φ = 27691972.

The previous prime is 27691927. The next prime is 27691991. The reversal of 27691973 is 37919672.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20811844 + 6880129 = 4562^2 + 2623^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27691973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27691913) 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, 13845986 + 13845987.

It is an arithmetic number, because the mean of its divisors is an integer number (13845987).

Almost surely, 2^27691973 is an apocalyptic number.

It is an amenable number.

27691973 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691973 is an equidigital number, since it uses as much as digits as its factorization.

27691973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 27691973 is about 5262.3163150841. The cubic root of 27691973 is about 302.5412752458.

The spelling of 27691973 in words is "twenty-seven million, six hundred ninety-one thousand, nine hundred seventy-three".