13521455 has 4 divisors (see below), whose sum is σ = 16225752. Its totient is φ = 10817160.

The previous prime is 13521449. The next prime is 13521461. The reversal of 13521455 is 55412531.

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

It is an interprime number because it is at equal distance from previous prime (13521449) and next prime (13521461).

It is not a de Polignac number, because 13521455 - 2¹⁰ = 13520431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1352141 + ... + 1352150.

It is an arithmetic number, because the mean of its divisors is an integer number (4056438).

Almost surely, 2^13521455 is an apocalyptic number.

13521455 is a deficient number, since it is larger than the sum of its proper divisors (2704297).

13521455 is an equidigital number, since it uses as much as digits as its factorization.

13521455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704296.

The product of its digits is 3000, while the sum is 26.

The square root of 13521455 is about 3677.1531107638. The cubic root of 13521455 is about 238.2362306223.

Adding to 13521455 its reverse (55412531), we get a palindrome (68933986).

The spelling of 13521455 in words is "thirteen million, five hundred twenty-one thousand, four hundred fifty-five".