1935128081 has 2 divisors, whose sum is σ = 1935128082. Its totient is φ = 1935128080.

The previous prime is 1935128077. The next prime is 1935128099. The reversal of 1935128081 is 1808215391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1133332225 + 801795856 = 33665^2 + 28316^2 .

It is an emirp because it is prime and its reverse (1808215391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1935128081 - 2² = 1935128077 is a prime.

It is a super-2 number, since 2×1935128081² = 7489441379749485122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1935128021) 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, 967564040 + 967564041.

It is an arithmetic number, because the mean of its divisors is an integer number (967564041).

Almost surely, 2^1935128081 is an apocalyptic number.

It is an amenable number.

1935128081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1935128081 is an equidigital number, since it uses as much as digits as its factorization.

1935128081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 1935128081 is about 43990.0907137051. The cubic root of 1935128081 is about 1246.1488040977.

The spelling of 1935128081 in words is "one billion, nine hundred thirty-five million, one hundred twenty-eight thousand, eighty-one".