4020556381 has 2 divisors, whose sum is σ = 4020556382. Its totient is φ = 4020556380.

The previous prime is 4020556363. The next prime is 4020556387. The reversal of 4020556381 is 1836550204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3980348100 + 40208281 = 63090^2 + 6341^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020556381 - 2¹¹ = 4020554333 is a prime.

It is a super-2 number, since 2×4020556381² = 32329747225599634322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020556387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010278190 + 2010278191.

It is an arithmetic number, because the mean of its divisors is an integer number (2010278191).

Almost surely, 2^4020556381 is an apocalyptic number.

It is an amenable number.

4020556381 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020556381 is an equidigital number, since it uses as much as digits as its factorization.

4020556381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 4020556381 is about 63407.8574074223. The cubic root of 4020556381 is about 1590.1156754311.

The spelling of 4020556381 in words is "four billion, twenty million, five hundred fifty-six thousand, three hundred eighty-one".