13857131 has 2 divisors, whose sum is σ = 13857132. Its totient is φ = 13857130.

The previous prime is 13857121. The next prime is 13857163. The reversal of 13857131 is 13175831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13857131 - 2¹⁰ = 13856107 is a prime.

It is a super-2 number, since 2×13857131² = 384040159102322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13857094 and 13857103.

It is not a weakly prime, because it can be changed into another prime (13857101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6928565 + 6928566.

It is an arithmetic number, because the mean of its divisors is an integer number (6928566).

Almost surely, 2^13857131 is an apocalyptic number.

13857131 is a deficient number, since it is larger than the sum of its proper divisors (1).

13857131 is an equidigital number, since it uses as much as digits as its factorization.

13857131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 13857131 is about 3722.5167561745. The cubic root of 13857131 is about 240.1915773589.

The spelling of 13857131 in words is "thirteen million, eight hundred fifty-seven thousand, one hundred thirty-one".