1089343891 has 8 divisors (see below), whose sum is σ = 1159563600. Its totient is φ = 1020412800.

The previous prime is 1089343847. The next prime is 1089343903. The reversal of 1089343891 is 1983439801.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1089343891 - 2¹³ = 1089335699 is a prime.

It is a super-2 number, since 2×1089343891² = 2373340225718039762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089343831) 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 7 ways as a sum of consecutive naturals, for example, 320410 + ... + 323791.

It is an arithmetic number, because the mean of its divisors is an integer number (144945450).

Almost surely, 2^1089343891 is an apocalyptic number.

1089343891 is a deficient number, since it is larger than the sum of its proper divisors (70219709).

1089343891 is an equidigital number, since it uses as much as digits as its factorization.

1089343891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644309.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1089343891 is about 33005.2100584135. The cubic root of 1089343891 is about 1028.9359328830.

The spelling of 1089343891 in words is "one billion, eighty-nine million, three hundred forty-three thousand, eight hundred ninety-one".