5781781 has 4 divisors (see below), whose sum is σ = 5796000. Its totient is φ = 5767564.

The previous prime is 5781749. The next prime is 5781791. The reversal of 5781781 is 1871875.

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 5781781 - 2⁵ = 5781749 is a prime.

It is a super-2 number, since 2×5781781² = 66857983063922, 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 5781781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5781791) 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, 6481 + ... + 7318.

It is an arithmetic number, because the mean of its divisors is an integer number (1449000).

Almost surely, 2^5781781 is an apocalyptic number.

It is an amenable number.

5781781 is a deficient number, since it is larger than the sum of its proper divisors (14219).

5781781 is a wasteful number, since it uses less digits than its factorization.

5781781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14218.

The product of its digits is 15680, while the sum is 37.

The square root of 5781781 is about 2404.5334266755. The cubic root of 5781781 is about 179.4818535205.

The spelling of 5781781 in words is "five million, seven hundred eighty-one thousand, seven hundred eighty-one".