13145231 has 4 divisors (see below), whose sum is σ = 14340264. Its totient is φ = 11950200.

The previous prime is 13145203. The next prime is 13145243. The reversal of 13145231 is 13254131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13145231 is a prime.

It is a super-2 number, since 2×13145231² = 345594196086722, 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 (13145201) 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, 597500 + ... + 597521.

It is an arithmetic number, because the mean of its divisors is an integer number (3585066).

Almost surely, 2^13145231 is an apocalyptic number.

13145231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13145231 is a deficient number, since it is larger than the sum of its proper divisors (1195033).

13145231 is a wasteful number, since it uses less digits than its factorization.

13145231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195032.

The product of its digits is 360, while the sum is 20.

The square root of 13145231 is about 3625.6352546830. The cubic root of 13145231 is about 236.0058351042.

Adding to 13145231 its reverse (13254131), we get a palindrome (26399362).

Subtracting 13145231 from its reverse (13254131), we obtain a square (108900 = 330²).

The spelling of 13145231 in words is "thirteen million, one hundred forty-five thousand, two hundred thirty-one".