13525181 has 4 divisors (see below), whose sum is σ = 13543452. Its totient is φ = 13506912.

The previous prime is 13525159. The next prime is 13525189. The reversal of 13525181 is 18152531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18152531 = 4051 ⋅4481.

It can be written as a sum of positive squares in 2 ways, for example, as 319225 + 13205956 = 565^2 + 3634^2 .

It is a cyclic number.

It is not a de Polignac number, because 13525181 - 2²² = 9330877 is a prime.

It is a super-2 number, since 2×13525181² = 365861042165522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 13525181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13525189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7976 + ... + 9521.

It is an arithmetic number, because the mean of its divisors is an integer number (3385863).

Almost surely, 2^13525181 is an apocalyptic number.

It is an amenable number.

13525181 is a deficient number, since it is larger than the sum of its proper divisors (18271).

13525181 is an equidigital number, since it uses as much as digits as its factorization.

13525181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18270.

The product of its digits is 1200, while the sum is 26.

The square root of 13525181 is about 3677.6597178097. The cubic root of 13525181 is about 238.2581115681.

The spelling of 13525181 in words is "thirteen million, five hundred twenty-five thousand, one hundred eighty-one".