13851231 has 4 divisors (see below), whose sum is σ = 18468312. Its totient is φ = 9234152.

The previous prime is 13851217. The next prime is 13851263. The reversal of 13851231 is 13215831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13851231 - 2¹¹ = 13849183 is a prime.

It is a super-2 number, since 2×13851231² = 383713200430722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13851631) 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, 2308536 + ... + 2308541.

It is an arithmetic number, because the mean of its divisors is an integer number (4617078).

Almost surely, 2^13851231 is an apocalyptic number.

13851231 is a deficient number, since it is larger than the sum of its proper divisors (4617081).

13851231 is an equidigital number, since it uses as much as digits as its factorization.

13851231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4617080.

The product of its digits is 720, while the sum is 24.

The square root of 13851231 is about 3721.7241971968. The cubic root of 13851231 is about 240.1574834453.

The spelling of 13851231 in words is "thirteen million, eight hundred fifty-one thousand, two hundred thirty-one".