1156020509 has 16 divisors (see below), whose sum is σ = 1356779520. Its totient is φ = 964519920.

The previous prime is 1156020497. The next prime is 1156020511. The reversal of 1156020509 is 9050206511.

It is not a de Polignac number, because 1156020509 - 2⁴ = 1156020493 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 (1156020589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24542 + ... + 53984.

It is an arithmetic number, because the mean of its divisors is an integer number (84798720).

Almost surely, 2^1156020509 is an apocalyptic number.

It is an amenable number.

1156020509 is a deficient number, since it is larger than the sum of its proper divisors (200759011).

1156020509 is an equidigital number, since it uses as much as digits as its factorization.

1156020509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29600.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 1156020509 is about 34000.3016016035. The cubic root of 1156020509 is about 1049.5146688264.

The spelling of 1156020509 in words is "one billion, one hundred fifty-six million, twenty thousand, five hundred nine".