4011209981 has 2 divisors, whose sum is σ = 4011209982. Its totient is φ = 4011209980.

The previous prime is 4011209977. The next prime is 4011209999. The reversal of 4011209981 is 1899021104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3853305625 + 157904356 = 62075^2 + 12566^2 .

It is a cyclic number.

It is not a de Polignac number, because 4011209981 - 2² = 4011209977 is a prime.

It is a super-2 number, since 2×4011209981² = 32179611023348040722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4011209941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2005604990 + 2005604991.

It is an arithmetic number, because the mean of its divisors is an integer number (2005604991).

Almost surely, 2^4011209981 is an apocalyptic number.

It is an amenable number.

4011209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4011209981 is an equidigital number, since it uses as much as digits as its factorization.

4011209981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 4011209981 is about 63334.1138802778. The cubic root of 4011209981 is about 1588.8825634886.

The spelling of 4011209981 in words is "four billion, eleven million, two hundred nine thousand, nine hundred eighty-one".