1155535539 has 8 divisors (see below), whose sum is σ = 1540934352. Its totient is φ = 770246880.

The previous prime is 1155535531. The next prime is 1155535541. The reversal of 1155535539 is 9355355511.

It is a happy number.

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

It is not a de Polignac number, because 1155535539 - 2³ = 1155535531 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155535539.

It is not an unprimeable number, because it can be changed into a prime (1155535531) 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, 1237 + ... + 48089.

It is an arithmetic number, because the mean of its divisors is an integer number (192616794).

Almost surely, 2^1155535539 is an apocalyptic number.

1155535539 is a deficient number, since it is larger than the sum of its proper divisors (385398813).

1155535539 is an equidigital number, since it uses as much as digits as its factorization.

1155535539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55077.

The product of its digits is 253125, while the sum is 42.

The square root of 1155535539 is about 33993.1690049633. The cubic root of 1155535539 is about 1049.3678852941.

The spelling of 1155535539 in words is "one billion, one hundred fifty-five million, five hundred thirty-five thousand, five hundred thirty-nine".