1153321989 has 4 divisors (see below), whose sum is σ = 1537762656. Its totient is φ = 768881324.

The previous prime is 1153321979. The next prime is 1153321993. The reversal of 1153321989 is 9891233511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9891233511 = 3 ⋅3297077837.

It is a cyclic number.

It is not a de Polignac number, because 1153321989 - 2⁸ = 1153321733 is a prime.

It is a super-2 number, since 2×1153321989² = 2660303220621832242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1153321989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153321919) 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, 192220329 + ... + 192220334.

It is an arithmetic number, because the mean of its divisors is an integer number (384440664).

Almost surely, 2^1153321989 is an apocalyptic number.

It is an amenable number.

1153321989 is a deficient number, since it is larger than the sum of its proper divisors (384440667).

1153321989 is an equidigital number, since it uses as much as digits as its factorization.

1153321989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384440666.

The product of its digits is 58320, while the sum is 42.

The square root of 1153321989 is about 33960.5946502708. The cubic root of 1153321989 is about 1048.6973987558.

The spelling of 1153321989 in words is "one billion, one hundred fifty-three million, three hundred twenty-one thousand, nine hundred eighty-nine".