13521869 has 4 divisors (see below), whose sum is σ = 13532640. Its totient is φ = 13511100.

The previous prime is 13521829. The next prime is 13521881. The reversal of 13521869 is 96812531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96812531 = 4243 ⋅22817.

It is a cyclic number.

It is not a de Polignac number, because 13521869 - 2¹² = 13517773 is a prime.

It is a super-2 number, since 2×13521869² = 365681882506322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521829) 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, 3209 + ... + 6110.

It is an arithmetic number, because the mean of its divisors is an integer number (3383160).

Almost surely, 2^13521869 is an apocalyptic number.

It is an amenable number.

13521869 is a deficient number, since it is larger than the sum of its proper divisors (10771).

13521869 is an equidigital number, since it uses as much as digits as its factorization.

13521869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10770.

The product of its digits is 12960, while the sum is 35.

The square root of 13521869 is about 3677.2094038822. The cubic root of 13521869 is about 238.2386620370.

The spelling of 13521869 in words is "thirteen million, five hundred twenty-one thousand, eight hundred sixty-nine".