13608691 has 2 divisors, whose sum is σ = 13608692. Its totient is φ = 13608690.

The previous prime is 13608671. The next prime is 13608697. The reversal of 13608691 is 19680631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13608691 - 2¹¹ = 13606643 is a prime.

It is not a weakly prime, because it can be changed into another prime (13608697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6804345 + 6804346.

It is an arithmetic number, because the mean of its divisors is an integer number (6804346).

Almost surely, 2^13608691 is an apocalyptic number.

13608691 is a deficient number, since it is larger than the sum of its proper divisors (1).

13608691 is an equidigital number, since it uses as much as digits as its factorization.

13608691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13608691 is about 3688.9959338552. The cubic root of 13608691 is about 238.7474734526.

The spelling of 13608691 in words is "thirteen million, six hundred eight thousand, six hundred ninety-one".