6873781 has 2 divisors, whose sum is σ = 6873782. Its totient is φ = 6873780.

The previous prime is 6873767. The next prime is 6873791. The reversal of 6873781 is 1873786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4284900 + 2588881 = 2070^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 6873781 - 2⁷ = 6873653 is a prime.

It is a super-2 number, since 2×6873781² = 94497730471922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6873721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3436890 + 3436891.

It is an arithmetic number, because the mean of its divisors is an integer number (3436891).

Almost surely, 2^6873781 is an apocalyptic number.

6873781 is the 1173-rd centered decagonal number.

It is an amenable number.

6873781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6873781 is an equidigital number, since it uses as much as digits as its factorization.

6873781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 6873781 is about 2621.7896559411. The cubic root of 6873781 is about 190.1363840731.

The spelling of 6873781 in words is "six million, eight hundred seventy-three thousand, seven hundred eighty-one".