4020313981 has 2 divisors, whose sum is σ = 4020313982. Its totient is φ = 4020313980.

The previous prime is 4020313951. The next prime is 4020314027. The reversal of 4020313981 is 1893130204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2770337956 + 1249976025 = 52634^2 + 35355^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020313981 - 2¹⁹ = 4019789693 is a prime.

It is a super-2 number, since 2×4020313981² = 32325849011648136722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020313931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010156990 + 2010156991.

It is an arithmetic number, because the mean of its divisors is an integer number (2010156991).

Almost surely, 2^4020313981 is an apocalyptic number.

It is an amenable number.

4020313981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020313981 is an equidigital number, since it uses as much as digits as its factorization.

4020313981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 4020313981 is about 63405.9459435785. The cubic root of 4020313981 is about 1590.0837186777.

The spelling of 4020313981 in words is "four billion, twenty million, three hundred thirteen thousand, nine hundred eighty-one".