13131018 has 16 divisors (see below), whose sum is σ = 29180160. Its totient is φ = 4376988.

The previous prime is 13131017. The next prime is 13131023. The reversal of 13131018 is 81013131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (13131017) 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, 121530 + ... + 121637.

It is an arithmetic number, because the mean of its divisors is an integer number (1823760).

Almost surely, 2^13131018 is an apocalyptic number.

13131018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13131018 is an abundant number, since it is smaller than the sum of its proper divisors (16049142).

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

13131018 is a wasteful number, since it uses less digits than its factorization.

13131018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243178 (or 243172 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 13131018 is about 3623.6746542702. The cubic root of 13131018 is about 235.9207456752.

Adding to 13131018 its reverse (81013131), we get a palindrome (94144149).

It can be divided in two parts, 131310 and 18, that added together give a triangular number (131328 = T₅₁₂).

The spelling of 13131018 in words is "thirteen million, one hundred thirty-one thousand, eighteen".