1028877581 has 2 divisors, whose sum is σ = 1028877582. Its totient is φ = 1028877580.

The previous prime is 1028877559. The next prime is 1028877599. The reversal of 1028877581 is 1857788201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 764522500 + 264355081 = 27650^2 + 16259^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028877581 - 2¹⁰ = 1028876557 is a prime.

It is a super-2 number, since 2×1028877581² = 2117178153368823122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028877541) 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, 514438790 + 514438791.

It is an arithmetic number, because the mean of its divisors is an integer number (514438791).

Almost surely, 2^1028877581 is an apocalyptic number.

It is an amenable number.

1028877581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028877581 is an equidigital number, since it uses as much as digits as its factorization.

1028877581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250880, while the sum is 47.

The square root of 1028877581 is about 32076.1216639419. The cubic root of 1028877581 is about 1009.5346616296.

The spelling of 1028877581 in words is "one billion, twenty-eight million, eight hundred seventy-seven thousand, five hundred eighty-one".