13691897 has 2 divisors, whose sum is σ = 13691898. Its totient is φ = 13691896.

The previous prime is 13691891. The next prime is 13691903. The reversal of 13691897 is 79819631.

It is a balanced prime because it is at equal distance from previous prime (13691891) and next prime (13691903).

It can be written as a sum of positive squares in only one way, i.e., 11999296 + 1692601 = 3464^2 + 1301^2 .

It is an emirp because it is prime and its reverse (79819631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13691897 - 2¹² = 13687801 is a prime.

It is not a weakly prime, because it can be changed into another prime (13691891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6845948 + 6845949.

It is an arithmetic number, because the mean of its divisors is an integer number (6845949).

Almost surely, 2^13691897 is an apocalyptic number.

It is an amenable number.

13691897 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691897 is an equidigital number, since it uses as much as digits as its factorization.

13691897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 13691897 is about 3700.2563424714. The cubic root of 13691897 is about 239.2330668801.

The spelling of 13691897 in words is "thirteen million, six hundred ninety-one thousand, eight hundred ninety-seven".