2067781 has 2 divisors, whose sum is σ = 2067782. Its totient is φ = 2067780.

The previous prime is 2067739. The next prime is 2067797. The reversal of 2067781 is 1877602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1846881 + 220900 = 1359^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 2067781 - 2⁹ = 2067269 is a prime.

It is a super-2 number, since 2×2067781² = 8551436527922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2067721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033890 + 1033891.

It is an arithmetic number, because the mean of its divisors is an integer number (1033891).

2^2067781 is an apocalyptic number.

It is an amenable number.

2067781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2067781 is an equidigital number, since it uses as much as digits as its factorization.

2067781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 2067781 is about 1437.9780944090. The cubic root of 2067781 is about 127.3996339450.

The spelling of 2067781 in words is "two million, sixty-seven thousand, seven hundred eighty-one".