13723531 has 4 divisors (see below), whose sum is σ = 13759200. Its totient is φ = 13687864.

The previous prime is 13723513. The next prime is 13723537. The reversal of 13723531 is 13532731.

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 13723531 - 2¹⁷ = 13592459 is a prime.

It is a super-2 number, since 2×13723531² = 376670606215922, 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 = 13723496 and 13723505.

It is not an unprimeable number, because it can be changed into a prime (13723537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17251 + ... + 18028.

It is an arithmetic number, because the mean of its divisors is an integer number (3439800).

Almost surely, 2^13723531 is an apocalyptic number.

13723531 is a deficient number, since it is larger than the sum of its proper divisors (35669).

13723531 is an equidigital number, since it uses as much as digits as its factorization.

13723531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35668.

The product of its digits is 1890, while the sum is 25.

The square root of 13723531 is about 3704.5284450251. The cubic root of 13723531 is about 239.4171679333.

The spelling of 13723531 in words is "thirteen million, seven hundred twenty-three thousand, five hundred thirty-one".