1165252989 has 16 divisors (see below), whose sum is σ = 1565729600. Its totient is φ = 770829696.

The previous prime is 1165252987. The next prime is 1165253003. The reversal of 1165252989 is 9892525611.

It is not a de Polignac number, because 1165252989 - 2¹ = 1165252987 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 (1165252987) 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, 212322 + ... + 217740.

It is an arithmetic number, because the mean of its divisors is an integer number (97858100).

Almost surely, 2^1165252989 is an apocalyptic number.

It is an amenable number.

1165252989 is a deficient number, since it is larger than the sum of its proper divisors (400476611).

1165252989 is a wasteful number, since it uses less digits than its factorization.

1165252989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5964.

The product of its digits is 388800, while the sum is 48.

The square root of 1165252989 is about 34135.8021584377. The cubic root of 1165252989 is about 1052.3012231551.

The spelling of 1165252989 in words is "one billion, one hundred sixty-five million, two hundred fifty-two thousand, nine hundred eighty-nine".