2028007981 has 2 divisors, whose sum is σ = 2028007982. Its totient is φ = 2028007980.

The previous prime is 2028007967. The next prime is 2028008027. The reversal of 2028007981 is 1897008202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1303859881 + 724148100 = 36109^2 + 26910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2028007981 - 2⁷ = 2028007853 is a prime.

It is a super-2 number, since 2×2028007981² = 8225632741999392722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2028007981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2028007901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014003990 + 1014003991.

It is an arithmetic number, because the mean of its divisors is an integer number (1014003991).

Almost surely, 2^2028007981 is an apocalyptic number.

It is an amenable number.

2028007981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2028007981 is an equidigital number, since it uses as much as digits as its factorization.

2028007981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 2028007981 is about 45033.4096088671. The cubic root of 2028007981 is about 1265.7751150589.

The spelling of 2028007981 in words is "two billion, twenty-eight million, seven thousand, nine hundred eighty-one".