13501231 has 4 divisors (see below), whose sum is σ = 13541632. Its totient is φ = 13460832.

The previous prime is 13501219. The next prime is 13501249. The reversal of 13501231 is 13210531.

13501231 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.

It is a cyclic number.

It is not a de Polignac number, because 13501231 - 2¹⁵ = 13468463 is a prime.

It is a super-2 number, since 2×13501231² = 364566477030722, 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 (13501291) 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, 19695 + ... + 20368.

It is an arithmetic number, because the mean of its divisors is an integer number (3385408).

Almost surely, 2^13501231 is an apocalyptic number.

13501231 is a deficient number, since it is larger than the sum of its proper divisors (40401).

13501231 is an equidigital number, since it uses as much as digits as its factorization.

13501231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40400.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 13501231 is about 3674.4021282380. The cubic root of 13501231 is about 238.1173949482.

Adding to 13501231 its reverse (13210531), we get a palindrome (26711762).

The spelling of 13501231 in words is "thirteen million, five hundred one thousand, two hundred thirty-one".