4066981 has 2 divisors, whose sum is σ = 4066982. Its totient is φ = 4066980.

The previous prime is 4066949. The next prime is 4066987. The reversal of 4066981 is 1896604.

4066981 is nontrivially palindromic in base 9.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2220100 + 1846881 = 1490^2 + 1359^2 .

It is a cyclic number.

It is not a de Polignac number, because 4066981 - 2⁵ = 4066949 is a prime.

It is a super-2 number, since 2×4066981² = 33080668908722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4066987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2033490 + 2033491.

It is an arithmetic number, because the mean of its divisors is an integer number (2033491).

Almost surely, 2^4066981 is an apocalyptic number.

It is an amenable number.

4066981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4066981 is an equidigital number, since it uses as much as digits as its factorization.

4066981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 4066981 is about 2016.6757300072. The cubic root of 4066981 is about 159.6212525849.

The spelling of 4066981 in words is "four million, sixty-six thousand, nine hundred eighty-one".