1161537539 has 4 divisors (see below), whose sum is σ = 1180579200. Its totient is φ = 1142495880.

The previous prime is 1161537523. The next prime is 1161537541. The reversal of 1161537539 is 9357351611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1161537539 - 2⁴ = 1161537523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161537496 and 1161537505.

It is not an unprimeable number, because it can be changed into a prime (1161539539) 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, 9520739 + ... + 9520860.

It is an arithmetic number, because the mean of its divisors is an integer number (295144800).

Almost surely, 2^1161537539 is an apocalyptic number.

1161537539 is a deficient number, since it is larger than the sum of its proper divisors (19041661).

1161537539 is an equidigital number, since it uses as much as digits as its factorization.

1161537539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19041660.

The product of its digits is 85050, while the sum is 41.

The square root of 1161537539 is about 34081.3371069857. The cubic root of 1161537539 is about 1051.1815992120.

The spelling of 1161537539 in words is "one billion, one hundred sixty-one million, five hundred thirty-seven thousand, five hundred thirty-nine".