13001231 has 4 divisors (see below), whose sum is σ = 13009464. Its totient is φ = 12993000.

The previous prime is 13001213. The next prime is 13001237. The reversal of 13001231 is 13210031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13210031 = 83 ⋅159157.

It is a cyclic number.

It is not a de Polignac number, because 13001231 - 2¹⁸ = 12739087 is a prime.

It is a super-2 number, since 2×13001231² = 338064015030722, 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 (13001237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920 + ... + 5181.

It is an arithmetic number, because the mean of its divisors is an integer number (3252366).

Almost surely, 2^13001231 is an apocalyptic number.

13001231 is a deficient number, since it is larger than the sum of its proper divisors (8233).

13001231 is an equidigital number, since it uses as much as digits as its factorization.

13001231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8232.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 13001231 is about 3605.7219804084. The cubic root of 13001231 is about 235.1408903148.

Adding to 13001231 its reverse (13210031), we get a palindrome (26211262).

The spelling of 13001231 in words is "thirteen million, one thousand, two hundred thirty-one".