13131442 has 4 divisors (see below), whose sum is σ = 19697166. Its totient is φ = 6565720.

The previous prime is 13131421. The next prime is 13131449. The reversal of 13131442 is 24413131.

13131442 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, and also an emirpimes, since its reverse is a distinct semiprime: 24413131 = 1021 ⋅23911.

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 4363921 = 2961^2 + 2089^2 .

It is not an unprimeable number, because it can be changed into a prime (13131449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282859 + ... + 3282862.

Almost surely, 2^13131442 is an apocalyptic number.

13131442 is a deficient number, since it is larger than the sum of its proper divisors (6565724).

13131442 is an equidigital number, since it uses as much as digits as its factorization.

13131442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6565723.

The product of its digits is 288, while the sum is 19.

The square root of 13131442 is about 3623.7331579464. The cubic root of 13131442 is about 235.9232849381.

Adding to 13131442 its reverse (24413131), we get a palindrome (37544573).

The spelling of 13131442 in words is "thirteen million, one hundred thirty-one thousand, four hundred forty-two".