5671781 has 4 divisors (see below), whose sum is σ = 5677452. Its totient is φ = 5666112.

The previous prime is 5671769. The next prime is 5671789. The reversal of 5671781 is 1871765.

5671781 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4879681 + 792100 = 2209^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 5671781 - 2⁶ = 5671717 is a prime.

It is a super-2 number, since 2×5671781² = 64338199423922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5671789) 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, 890 + ... + 3483.

It is an arithmetic number, because the mean of its divisors is an integer number (1419363).

Almost surely, 2^5671781 is an apocalyptic number.

It is an amenable number.

5671781 is a deficient number, since it is larger than the sum of its proper divisors (5671).

5671781 is a wasteful number, since it uses less digits than its factorization.

5671781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5670.

The product of its digits is 11760, while the sum is 35.

The square root of 5671781 is about 2381.5501254435. The cubic root of 5671781 is about 178.3363270428.

The spelling of 5671781 in words is "five million, six hundred seventy-one thousand, seven hundred eighty-one".