13431857 has 2 divisors, whose sum is σ = 13431858. Its totient is φ = 13431856.

The previous prime is 13431811. The next prime is 13431863. The reversal of 13431857 is 75813431.

13431857 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6754801 + 6677056 = 2599^2 + 2584^2 .

It is an emirp because it is prime and its reverse (75813431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13431857 - 2¹² = 13427761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13431757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6715928 + 6715929.

It is an arithmetic number, because the mean of its divisors is an integer number (6715929).

Almost surely, 2^13431857 is an apocalyptic number.

It is an amenable number.

13431857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13431857 is an equidigital number, since it uses as much as digits as its factorization.

13431857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 13431857 is about 3664.9497950177. The cubic root of 13431857 is about 237.7088511910.

The spelling of 13431857 in words is "thirteen million, four hundred thirty-one thousand, eight hundred fifty-seven".