4001759981 has 2 divisors, whose sum is σ = 4001759982. Its totient is φ = 4001759980.

The previous prime is 4001759977. The next prime is 4001760013. The reversal of 4001759981 is 1899571004.

4001759981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3988554025 + 13205956 = 63155^2 + 3634^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001759981 - 2² = 4001759977 is a prime.

It is a super-2 number, since 2×4001759981² = 32028165891066240722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001749981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000879990 + 2000879991.

It is an arithmetic number, because the mean of its divisors is an integer number (2000879991).

Almost surely, 2^4001759981 is an apocalyptic number.

It is an amenable number.

4001759981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001759981 is an equidigital number, since it uses as much as digits as its factorization.

4001759981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 4001759981 is about 63259.4655446914. The cubic root of 4001759981 is about 1587.6338341381.

The spelling of 4001759981 in words is "four billion, one million, seven hundred fifty-nine thousand, nine hundred eighty-one".