13643431 has 4 divisors (see below), whose sum is σ = 13835664. Its totient is φ = 13451200.

The previous prime is 13643407. The next prime is 13643437. The reversal of 13643431 is 13434631.

It is a happy number.

13643431 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 semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13643431 - 2⁹ = 13642919 is a prime.

It is a super-2 number, since 2×13643431² = 372286418903522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13643396 and 13643405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13643437) 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, 96010 + ... + 96151.

It is an arithmetic number, because the mean of its divisors is an integer number (3458916).

Almost surely, 2^13643431 is an apocalyptic number.

13643431 is a deficient number, since it is larger than the sum of its proper divisors (192233).

13643431 is an equidigital number, since it uses as much as digits as its factorization.

13643431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192232.

The product of its digits is 2592, while the sum is 25.

The square root of 13643431 is about 3693.7015309849. The cubic root of 13643431 is about 238.9504574516.

The spelling of 13643431 in words is "thirteen million, six hundred forty-three thousand, four hundred thirty-one".