13152521 has 4 divisors (see below), whose sum is σ = 13288212. Its totient is φ = 13016832.

The previous prime is 13152511. The next prime is 13152563. The reversal of 13152521 is 12525131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 2524921 = 3260^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 13152521 - 2²² = 8958217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13152493 and 13152502.

It is not an unprimeable number, because it can be changed into a prime (13152511) 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, 67700 + ... + 67893.

It is an arithmetic number, because the mean of its divisors is an integer number (3322053).

Almost surely, 2^13152521 is an apocalyptic number.

It is an amenable number.

13152521 is a deficient number, since it is larger than the sum of its proper divisors (135691).

13152521 is an equidigital number, since it uses as much as digits as its factorization.

13152521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135690.

The product of its digits is 300, while the sum is 20.

The square root of 13152521 is about 3626.6404564004. The cubic root of 13152521 is about 236.0494545885.

Adding to 13152521 its reverse (12525131), we get a palindrome (25677652).

The spelling of 13152521 in words is "thirteen million, one hundred fifty-two thousand, five hundred twenty-one".