2061128781 has 8 divisors (see below), whose sum is σ = 3053524160. Its totient is φ = 1374085836.

The previous prime is 2061128779. The next prime is 2061128789. The reversal of 2061128781 is 1878211602.

It is not a de Polignac number, because 2061128781 - 2¹ = 2061128779 is a prime.

It is a super-2 number, since 2×2061128781² = 8496503703733091922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061128789) 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 in 7 ways as a sum of consecutive naturals, for example, 38169025 + ... + 38169078.

It is an arithmetic number, because the mean of its divisors is an integer number (381690520).

Almost surely, 2^2061128781 is an apocalyptic number.

It is an amenable number.

2061128781 is a deficient number, since it is larger than the sum of its proper divisors (992395379).

2061128781 is an equidigital number, since it uses as much as digits as its factorization.

2061128781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76338112 (or 76338106 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 2061128781 is about 45399.6561771122. The cubic root of 2061128781 is about 1272.6286886396.

The spelling of 2061128781 in words is "two billion, sixty-one million, one hundred twenty-eight thousand, seven hundred eighty-one".