13531818 has 8 divisors (see below), whose sum is σ = 27063648. Its totient is φ = 4510604.

The previous prime is 13531811. The next prime is 13531849. The reversal of 13531818 is 81813531.

It is a sphenic number, since it is the product of 3 distinct primes.

13531818 is an admirable number.

It is a super-2 number, since 2×13531818² = 366220196770248, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13531811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127646 + ... + 1127657.

It is an arithmetic number, because the mean of its divisors is an integer number (3382956).

Almost surely, 2^13531818 is an apocalyptic number.

13531818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13531818 is a wasteful number, since it uses less digits than its factorization.

13531818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255308.

The product of its digits is 2880, while the sum is 30.

The square root of 13531818 is about 3678.5619472832. The cubic root of 13531818 is about 238.2970774175.

The spelling of 13531818 in words is "thirteen million, five hundred thirty-one thousand, eight hundred eighteen".