13857031 has 4 divisors (see below), whose sum is σ = 14304064. Its totient is φ = 13410000.

The previous prime is 13857029. The next prime is 13857047. The reversal of 13857031 is 13075831.

13857031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13075831 = 31 ⋅421801.

It is a cyclic number.

It is not a de Polignac number, because 13857031 - 2¹ = 13857029 is a prime.

It is a super-2 number, since 2×13857031² = 384034616269922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13857001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223470 + ... + 223531.

It is an arithmetic number, because the mean of its divisors is an integer number (3576016).

Almost surely, 2^13857031 is an apocalyptic number.

13857031 is a deficient number, since it is larger than the sum of its proper divisors (447033).

13857031 is an equidigital number, since it uses as much as digits as its factorization.

13857031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447032.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 13857031 is about 3722.5033243773. The cubic root of 13857031 is about 240.1909995766.

It can be divided in two parts, 138570 and 31, that added together give a triangular number (138601 = T₅₂₆).

The spelling of 13857031 in words is "thirteen million, eight hundred fifty-seven thousand, thirty-one".