1089236655 has 144 divisors (see below), whose sum is σ = 2232528480. Its totient is φ = 486839808.

The previous prime is 1089236653. The next prime is 1089236657. The reversal of 1089236655 is 5566329801.

It is an interprime number because it is at equal distance from previous prime (1089236653) and next prime (1089236657).

It is not a de Polignac number, because 1089236655 - 2¹ = 1089236653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1089236655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089236651) 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 143 ways as a sum of consecutive naturals, for example, 20551609 + ... + 20551661.

It is an arithmetic number, because the mean of its divisors is an integer number (15503670).

Almost surely, 2^1089236655 is an apocalyptic number.

1089236655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1089236655 is an abundant number, since it is smaller than the sum of its proper divisors (1143291825).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1089236655 is a wasteful number, since it uses less digits than its factorization.

1089236655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 1089236655 is about 33003.5854870346. The cubic root of 1089236655 is about 1028.9021686465.

The spelling of 1089236655 in words is "one billion, eighty-nine million, two hundred thirty-six thousand, six hundred fifty-five".