13209481 has 6 divisors (see below), whose sum is σ = 13577550. Its totient is φ = 12851136.

The previous prime is 13209467. The next prime is 13209517. The reversal of 13209481 is 18490231.

It is a happy number.

13209481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 4477456 + 8732025 = 2116^2 + 2955^2 .

It is not a de Polignac number, because 13209481 - 2²¹ = 11112329 is a prime.

It is a super-2 number, since 2×13209481² = 348980776578722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13209401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3456 + ... + 6193.

It is an arithmetic number, because the mean of its divisors is an integer number (2262925).

Almost surely, 2^13209481 is an apocalyptic number.

It is an amenable number.

13209481 is a deficient number, since it is larger than the sum of its proper divisors (368069).

13209481 is an frugal number, since it uses more digits than its factorization.

13209481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9723 (or 9686 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 13209481 is about 3634.4849703913. The cubic root of 13209481 is about 236.3897192437.

It can be divided in two parts, 1320 and 9481, that added together give a palindrome (10801).

The spelling of 13209481 in words is "thirteen million, two hundred nine thousand, four hundred eighty-one".