13281018 has 16 divisors (see below), whose sum is σ = 27012960. Its totient is φ = 4351856.

The previous prime is 13281017. The next prime is 13281031. The reversal of 13281018 is 81018231.

It is not an unprimeable number, because it can be changed into a prime (13281017) 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, 18405 + ... + 19112.

It is an arithmetic number, because the mean of its divisors is an integer number (1688310).

Almost surely, 2^13281018 is an apocalyptic number.

13281018 is an abundant number, since it is smaller than the sum of its proper divisors (13731942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13281018 is a wasteful number, since it uses less digits than its factorization.

13281018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37581.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 13281018 is about 3644.3131040019. The cubic root of 13281018 is about 236.8156803631.

Adding to 13281018 its reverse (81018231), we get a palindrome (94299249).

It can be divided in two parts, 1328 and 1018, that added together give a triangular number (2346 = T₆₈).

The spelling of 13281018 in words is "thirteen million, two hundred eighty-one thousand, eighteen".