1089172447 has 32 divisors (see below), whose sum is σ = 1238630400. Its totient is φ = 949384800.

The previous prime is 1089172423. The next prime is 1089172453. The reversal of 1089172447 is 7442719801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089172447 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 (1089172547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7835704 + ... + 7835842.

It is an arithmetic number, because the mean of its divisors is an integer number (38707200).

Almost surely, 2^1089172447 is an apocalyptic number.

1089172447 is a deficient number, since it is larger than the sum of its proper divisors (149457953).

1089172447 is a wasteful number, since it uses less digits than its factorization.

1089172447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 1089172447 is about 33002.6127299037. The cubic root of 1089172447 is about 1028.8819511090.

It can be divided in two parts, 10891 and 72447, that added together give a palindrome (83338).

The spelling of 1089172447 in words is "one billion, eighty-nine million, one hundred seventy-two thousand, four hundred forty-seven".