1089321556 has 6 divisors (see below), whose sum is σ = 1906312730. Its totient is φ = 544660776.

The previous prime is 1089321539. The next prime is 1089321587. The reversal of 1089321556 is 6551239801.

It can be written as a sum of positive squares in only one way, i.e., 824608656 + 264712900 = 28716^2 + 16270^2 .

It is a super-2 number, since 2×1089321556² = 2373242904732522272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136165191 + ... + 136165198.

Almost surely, 2^1089321556 is an apocalyptic number.

It is an amenable number.

1089321556 is a deficient number, since it is larger than the sum of its proper divisors (816991174).

1089321556 is a wasteful number, since it uses less digits than its factorization.

1089321556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272330393 (or 272330391 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 1089321556 is about 33004.8717010080. The cubic root of 1089321556 is about 1028.9289006865.

The spelling of 1089321556 in words is "one billion, eighty-nine million, three hundred twenty-one thousand, five hundred fifty-six".