5673781 has 2 divisors, whose sum is σ = 5673782. Its totient is φ = 5673780.

The previous prime is 5673757. The next prime is 5673827. The reversal of 5673781 is 1873765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5564881 + 108900 = 2359^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 5673781 - 2⁷ = 5673653 is a prime.

It is a super-2 number, since 2×5673781² = 64383581671922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5673781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5673181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2836890 + 2836891.

It is an arithmetic number, because the mean of its divisors is an integer number (2836891).

Almost surely, 2^5673781 is an apocalyptic number.

It is an amenable number.

5673781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5673781 is an equidigital number, since it uses as much as digits as its factorization.

5673781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 5673781 is about 2381.9699830183. The cubic root of 5673781 is about 178.3572864051.

It can be divided in two parts, 56 and 73781, that added together give a palindrome (73837).

The spelling of 5673781 in words is "five million, six hundred seventy-three thousand, seven hundred eighty-one".