1089229987 has 4 divisors (see below), whose sum is σ = 1089392656. Its totient is φ = 1089067320.

The previous prime is 1089229979. The next prime is 1089230003. The reversal of 1089229987 is 7899229801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7899229801 = 3917 ⋅2016653.

It is a cyclic number.

It is not a de Polignac number, because 1089229987 - 2³ = 1089229979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089209987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70839 + ... + 84832.

It is an arithmetic number, because the mean of its divisors is an integer number (272348164).

Almost surely, 2^1089229987 is an apocalyptic number.

1089229987 is a deficient number, since it is larger than the sum of its proper divisors (162669).

1089229987 is an equidigital number, since it uses as much as digits as its factorization.

1089229987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162668.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 1089229987 is about 33003.4844675528. The cubic root of 1089229987 is about 1028.9000690924.

The spelling of 1089229987 in words is "one billion, eighty-nine million, two hundred twenty-nine thousand, nine hundred eighty-seven".