13181842 has 16 divisors (see below), whose sum is σ = 20696472. Its totient is φ = 6289920.

The previous prime is 13181827. The next prime is 13181843. The reversal of 13181842 is 24818131.

It can be written as a sum of positive squares in 4 ways, for example, as 13097161 + 84681 = 3619^2 + 291^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13181842.

It is not an unprimeable number, because it can be changed into a prime (13181843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2242 + ... + 5602.

Almost surely, 2^13181842 is an apocalyptic number.

13181842 is a deficient number, since it is larger than the sum of its proper divisors (7514630).

13181842 is a wasteful number, since it uses less digits than its factorization.

13181842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453.

The product of its digits is 1536, while the sum is 28.

The square root of 13181842 is about 3630.6806524397. The cubic root of 13181842 is about 236.2247332608.

Adding to 13181842 its reverse (24818131), we get a palindrome (37999973).

It can be divided in two parts, 1318 and 1842, that added together give a triangular number (3160 = T₇₉).

The spelling of 13181842 in words is "thirteen million, one hundred eighty-one thousand, eight hundred forty-two".