27691913 has 2 divisors, whose sum is σ = 27691914. Its totient is φ = 27691912.

The previous prime is 27691901. The next prime is 27691919. The reversal of 27691913 is 31919672.

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., 21501769 + 6190144 = 4637^2 + 2488^2 .

It is a cyclic number.

It is not a de Polignac number, because 27691913 - 2⁶ = 27691849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27691919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845956 + 13845957.

It is an arithmetic number, because the mean of its divisors is an integer number (13845957).

Almost surely, 2^27691913 is an apocalyptic number.

It is an amenable number.

27691913 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691913 is an equidigital number, since it uses as much as digits as its factorization.

27691913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 27691913 is about 5262.3106141694. The cubic root of 27691913 is about 302.5410567409.

The spelling of 27691913 in words is "twenty-seven million, six hundred ninety-one thousand, nine hundred thirteen".