1155587489 has 8 divisors (see below), whose sum is σ = 1321071168. Its totient is φ = 990203760.

The previous prime is 1155587483. The next prime is 1155587509. The reversal of 1155587489 is 9847855511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155587489 - 2¹² = 1155583393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155587489.

It is not an unprimeable number, because it can be changed into a prime (1155587483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1694 + ... + 48104.

It is an arithmetic number, because the mean of its divisors is an integer number (165133896).

Almost surely, 2^1155587489 is an apocalyptic number.

It is an amenable number.

1155587489 is a deficient number, since it is larger than the sum of its proper divisors (165483679).

1155587489 is an equidigital number, since it uses as much as digits as its factorization.

1155587489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49975.

The product of its digits is 2016000, while the sum is 53.

The square root of 1155587489 is about 33993.9331204849. The cubic root of 1155587489 is about 1049.3836107140.

The spelling of 1155587489 in words is "one billion, one hundred fifty-five million, five hundred eighty-seven thousand, four hundred eighty-nine".