2039655781 has 2 divisors, whose sum is σ = 2039655782. Its totient is φ = 2039655780.

The previous prime is 2039655773. The next prime is 2039655803. The reversal of 2039655781 is 1875569302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1742645025 + 297010756 = 41745^2 + 17234^2 .

It is a cyclic number.

It is not a de Polignac number, because 2039655781 - 2³ = 2039655773 is a prime.

It is a super-2 number, since 2×2039655781² = 8320391409933439922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2039655701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1019827890 + 1019827891.

It is an arithmetic number, because the mean of its divisors is an integer number (1019827891).

Almost surely, 2^2039655781 is an apocalyptic number.

It is an amenable number.

2039655781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2039655781 is an equidigital number, since it uses as much as digits as its factorization.

2039655781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 2039655781 is about 45162.5484334088. The cubic root of 2039655781 is about 1268.1938035745.

The spelling of 2039655781 in words is "two billion, thirty-nine million, six hundred fifty-five thousand, seven hundred eighty-one".