13011231 has 4 divisors (see below), whose sum is σ = 17348312. Its totient is φ = 8674152.

The previous prime is 13011223. The next prime is 13011253. The reversal of 13011231 is 13211031.

13011231 is digitally balanced in base 2 and base 4, 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, and also an emirpimes, since its reverse is a distinct semiprime: 13211031 = 3 ⋅4403677.

It is not a de Polignac number, because 13011231 - 2³ = 13011223 is a prime.

It is a super-2 number, since 2×13011231² = 338584264270722, 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 (13011281) 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, 2168536 + ... + 2168541.

It is an arithmetic number, because the mean of its divisors is an integer number (4337078).

Almost surely, 2^13011231 is an apocalyptic number.

13011231 is a deficient number, since it is larger than the sum of its proper divisors (4337081).

13011231 is an equidigital number, since it uses as much as digits as its factorization.

13011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337080.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 13011231 is about 3607.1083987039. The cubic root of 13011231 is about 235.2011616919.

Adding to 13011231 its reverse (13211031), we get a palindrome (26222262).

The spelling of 13011231 in words is "thirteen million, eleven thousand, two hundred thirty-one".