5208781 has 4 divisors (see below), whose sum is σ = 5286592. Its totient is φ = 5130972.

The previous prime is 5208779. The next prime is 5208799. The reversal of 5208781 is 1878025.

5208781 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.

It is a cyclic number.

It is not a de Polignac number, because 5208781 - 2¹ = 5208779 is a prime.

It is a super-2 number, since 2×5208781² = 54262799011922, which contains 22 as substring.

It is a Duffinian number.

5208781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5208701) 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, 38805 + ... + 38938.

It is an arithmetic number, because the mean of its divisors is an integer number (1321648).

Almost surely, 2^5208781 is an apocalyptic number.

It is an amenable number.

5208781 is a deficient number, since it is larger than the sum of its proper divisors (77811).

5208781 is an equidigital number, since it uses as much as digits as its factorization.

5208781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77810.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 5208781 is about 2282.2753996834. The cubic root of 5208781 is about 173.3452847611.

The spelling of 5208781 in words is "five million, two hundred eight thousand, seven hundred eighty-one".