1154815989 has 16 divisors (see below), whose sum is σ = 1596345600. Its totient is φ = 741698496.

The previous prime is 1154815979. The next prime is 1154816057. The reversal of 1154815989 is 9895184511.

It is not a de Polignac number, because 1154815989 - 2⁴ = 1154815973 is a prime.

It is a super-3 number, since 3×1154815989³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154815919) 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, 25947 + ... + 54615.

It is an arithmetic number, because the mean of its divisors is an integer number (99771600).

Almost surely, 2^1154815989 is an apocalyptic number.

It is an amenable number.

1154815989 is a deficient number, since it is larger than the sum of its proper divisors (441529611).

1154815989 is a wasteful number, since it uses less digits than its factorization.

1154815989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29164.

The product of its digits is 518400, while the sum is 51.

The square root of 1154815989 is about 33982.5836127861. The cubic root of 1154815989 is about 1049.1500268732.

The spelling of 1154815989 in words is "one billion, one hundred fifty-four million, eight hundred fifteen thousand, nine hundred eighty-nine".