13391857 has 2 divisors, whose sum is σ = 13391858. Its totient is φ = 13391856.

The previous prime is 13391839. The next prime is 13391867. The reversal of 13391857 is 75819331.

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., 10556001 + 2835856 = 3249^2 + 1684^2 .

It is a cyclic number.

It is not a de Polignac number, because 13391857 - 2¹⁵ = 13359089 is a prime.

It is not a weakly prime, because it can be changed into another prime (13391867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6695928 + 6695929.

It is an arithmetic number, because the mean of its divisors is an integer number (6695929).

Almost surely, 2^13391857 is an apocalyptic number.

It is an amenable number.

13391857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13391857 is an equidigital number, since it uses as much as digits as its factorization.

13391857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 13391857 is about 3659.4886254776. The cubic root of 13391857 is about 237.4726513292.

The spelling of 13391857 in words is "thirteen million, three hundred ninety-one thousand, eight hundred fifty-seven".