1101553989 has 4 divisors (see below), whose sum is σ = 1468738656. Its totient is φ = 734369324.

The previous prime is 1101553987. The next prime is 1101553991. The reversal of 1101553989 is 9893551011.

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: 9893551011 = 3 ⋅3297850337.

It is an interprime number because it is at equal distance from previous prime (1101553987) and next prime (1101553991).

It is a cyclic number.

It is not a de Polignac number, because 1101553989 - 2¹ = 1101553987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1101553989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101553987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183592329 + ... + 183592334.

It is an arithmetic number, because the mean of its divisors is an integer number (367184664).

Almost surely, 2^1101553989 is an apocalyptic number.

It is an amenable number.

1101553989 is a deficient number, since it is larger than the sum of its proper divisors (367184667).

1101553989 is an equidigital number, since it uses as much as digits as its factorization.

1101553989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367184666.

The product of its (nonzero) digits is 48600, while the sum is 42.

The square root of 1101553989 is about 33189.6669010100. Note that the first 3 decimals coincide. The cubic root of 1101553989 is about 1032.7659933752.

The spelling of 1101553989 in words is "one billion, one hundred one million, five hundred fifty-three thousand, nine hundred eighty-nine".