13581142 has 4 divisors (see below), whose sum is σ = 20371716. Its totient is φ = 6790570.

The previous prime is 13581137. The next prime is 13581149. The reversal of 13581142 is 24118531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24118531 = 2797 ⋅8623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13581149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3395284 + ... + 3395287.

It is an arithmetic number, because the mean of its divisors is an integer number (5092929).

Almost surely, 2^13581142 is an apocalyptic number.

13581142 is a deficient number, since it is larger than the sum of its proper divisors (6790574).

13581142 is an equidigital number, since it uses as much as digits as its factorization.

13581142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790573.

The product of its digits is 960, while the sum is 25.

The square root of 13581142 is about 3685.2600993688. The cubic root of 13581142 is about 238.5862603620.

Adding to 13581142 its reverse (24118531), we get a palindrome (37699673).

It can be divided in two parts, 1358 and 1142, that added together give a square (2500 = 50²).

The spelling of 13581142 in words is "thirteen million, five hundred eighty-one thousand, one hundred forty-two".