1155521487 has 8 divisors (see below), whose sum is σ = 1540965040. Its totient is φ = 770212800.

The previous prime is 1155521473. The next prime is 1155521509. The reversal of 1155521487 is 7841255511.

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

It is not a de Polignac number, because 1155521487 - 2¹⁴ = 1155505103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155521287) 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, 11662 + ... + 49467.

It is an arithmetic number, because the mean of its divisors is an integer number (192620630).

Almost surely, 2^1155521487 is an apocalyptic number.

1155521487 is a deficient number, since it is larger than the sum of its proper divisors (385443553).

1155521487 is an equidigital number, since it uses as much as digits as its factorization.

1155521487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67433.

The product of its digits is 56000, while the sum is 39.

The square root of 1155521487 is about 33992.9623157500. The cubic root of 1155521487 is about 1049.3636316308.

Adding to 1155521487 its reverse (7841255511), we get a palindrome (8996776998).

The spelling of 1155521487 in words is "one billion, one hundred fifty-five million, five hundred twenty-one thousand, four hundred eighty-seven".