1089209987 has 2 divisors, whose sum is σ = 1089209988. Its totient is φ = 1089209986.

The previous prime is 1089209981. The next prime is 1089210019. The reversal of 1089209987 is 7899029801.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1089209987 - 2⁶ = 1089209923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1089209981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544604993 + 544604994.

It is an arithmetic number, because the mean of its divisors is an integer number (544604994).

Almost surely, 2^1089209987 is an apocalyptic number.

1089209987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089209987 is an equidigital number, since it uses as much as digits as its factorization.

1089209987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 1089209987 is about 33003.1814678525. The cubic root of 1089209987 is about 1028.8937716384.

The spelling of 1089209987 in words is "one billion, eighty-nine million, two hundred nine thousand, nine hundred eighty-seven".