13521881 has 2 divisors, whose sum is σ = 13521882. Its totient is φ = 13521880.

The previous prime is 13521829. The next prime is 13521889. The reversal of 13521881 is 18812531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7070281 + 6451600 = 2659^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521881 - 2¹⁸ = 13259737 is a prime.

It is a super-2 number, since 2×13521881² = 365682531556322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13521889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760940 + 6760941.

It is an arithmetic number, because the mean of its divisors is an integer number (6760941).

Almost surely, 2^13521881 is an apocalyptic number.

It is an amenable number.

13521881 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521881 is an equidigital number, since it uses as much as digits as its factorization.

13521881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 29.

The square root of 13521881 is about 3677.2110355540. The cubic root of 13521881 is about 238.2387325121.

The spelling of 13521881 in words is "thirteen million, five hundred twenty-one thousand, eight hundred eighty-one".