1128561887 has 2 divisors, whose sum is σ = 1128561888. Its totient is φ = 1128561886.

The previous prime is 1128561817. The next prime is 1128561937. The reversal of 1128561887 is 7881658211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1128561887 - 2¹² = 1128557791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128561817) 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, 564280943 + 564280944.

It is an arithmetic number, because the mean of its divisors is an integer number (564280944).

Almost surely, 2^1128561887 is an apocalyptic number.

1128561887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128561887 is an equidigital number, since it uses as much as digits as its factorization.

1128561887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 47.

The square root of 1128561887 is about 33594.0751770308. The cubic root of 1128561887 is about 1041.1383882612.

The spelling of 1128561887 in words is "one billion, one hundred twenty-eight million, five hundred sixty-one thousand, eight hundred eighty-seven".