13359781 has 4 divisors (see below), whose sum is σ = 13367200. Its totient is φ = 13352364.

The previous prime is 13359767. The next prime is 13359823. The reversal of 13359781 is 18795331.

It is a happy number.

13359781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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: 18795331 = 31 ⋅606301.

It is a cyclic number.

It is not a de Polignac number, because 13359781 - 2¹³ = 13351589 is a prime.

It is a super-2 number, since 2×13359781² = 356967496735922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13359781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13359751) 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, 910 + ... + 5248.

It is an arithmetic number, because the mean of its divisors is an integer number (3341800).

Almost surely, 2^13359781 is an apocalyptic number.

It is an amenable number.

13359781 is a deficient number, since it is larger than the sum of its proper divisors (7419).

13359781 is an equidigital number, since it uses as much as digits as its factorization.

13359781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7418.

The product of its digits is 22680, while the sum is 37.

The square root of 13359781 is about 3655.1034185095. The cubic root of 13359781 is about 237.2829026287.

The spelling of 13359781 in words is "thirteen million, three hundred fifty-nine thousand, seven hundred eighty-one".