13283781 has 8 divisors (see below), whose sum is σ = 20241984. Its totient is φ = 7590720.

The previous prime is 13283759. The next prime is 13283789. The reversal of 13283781 is 18738231.

13283781 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13283781 - 2¹⁰ = 13282757 is a prime.

It is a super-2 number, since 2×13283781² = 352917675311922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13283789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316260 + ... + 316301.

It is an arithmetic number, because the mean of its divisors is an integer number (2530248).

Almost surely, 2^13283781 is an apocalyptic number.

It is an amenable number.

13283781 is a deficient number, since it is larger than the sum of its proper divisors (6958203).

13283781 is an equidigital number, since it uses as much as digits as its factorization.

13283781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632571.

The product of its digits is 8064, while the sum is 33.

The square root of 13283781 is about 3644.6921680713. The cubic root of 13283781 is about 236.8321017035.

The spelling of 13283781 in words is "thirteen million, two hundred eighty-three thousand, seven hundred eighty-one".