13691947 has 2 divisors, whose sum is σ = 13691948. Its totient is φ = 13691946.

The previous prime is 13691941. The next prime is 13691963. The reversal of 13691947 is 74919631.

13691947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13691947 - 2³ = 13691939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13691941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6845973 + 6845974.

It is an arithmetic number, because the mean of its divisors is an integer number (6845974).

Almost surely, 2^13691947 is an apocalyptic number.

13691947 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691947 is an equidigital number, since it uses as much as digits as its factorization.

13691947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 13691947 is about 3700.2630987539. The cubic root of 13691947 is about 239.2333580898.

The spelling of 13691947 in words is "thirteen million, six hundred ninety-one thousand, nine hundred forty-seven".