27309691 has 2 divisors, whose sum is σ = 27309692. Its totient is φ = 27309690.

The previous prime is 27309673. The next prime is 27309719. The reversal of 27309691 is 19690372.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27309691 - 2¹⁹ = 26785403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27309691.

It is not a weakly prime, because it can be changed into another prime (27309641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13654845 + 13654846.

It is an arithmetic number, because the mean of its divisors is an integer number (13654846).

Almost surely, 2^27309691 is an apocalyptic number.

27309691 is a deficient number, since it is larger than the sum of its proper divisors (1).

27309691 is an equidigital number, since it uses as much as digits as its factorization.

27309691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 27309691 is about 5225.8674877957. The cubic root of 27309691 is about 301.1426460449.

It can be divided in two parts, 2730 and 9691, that added together give a palindrome (12421).

The spelling of 27309691 in words is "twenty-seven million, three hundred nine thousand, six hundred ninety-one".