27691901 has 2 divisors, whose sum is σ = 27691902. Its totient is φ = 27691900.

The previous prime is 27691891. The next prime is 27691913. The reversal of 27691901 is 10919672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21436900 + 6255001 = 4630^2 + 2501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27691901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27691991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845950 + 13845951.

It is an arithmetic number, because the mean of its divisors is an integer number (13845951).

Almost surely, 2^27691901 is an apocalyptic number.

It is an amenable number.

27691901 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691901 is an equidigital number, since it uses as much as digits as its factorization.

27691901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 27691901 is about 5262.3094739857. The cubic root of 27691901 is about 302.5410130399.

The spelling of 27691901 in words is "twenty-seven million, six hundred ninety-one thousand, nine hundred one".