1091085056 has 18 divisors (see below), whose sum is σ = 2177908572. Its totient is φ = 545542400.

The previous prime is 1091085029. The next prime is 1091085059. The reversal of 1091085056 is 6505801901.

It is not an unprimeable number, because it can be changed into a prime (1091085059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2130770 + ... + 2131281.

Almost surely, 2^1091085056 is an apocalyptic number.

1091085056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1091085056 is a deficient number, since it is larger than the sum of its proper divisors (1086823516).

1091085056 is an frugal number, since it uses more digits than its factorization.

1091085056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262067 (or 4262053 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 1091085056 is about 33031.5766502297. The cubic root of 1091085056 is about 1029.4838448209.

Adding to 1091085056 its reverse (6505801901), we get a palindrome (7596886957).

The spelling of 1091085056 in words is "one billion, ninety-one million, eighty-five thousand, fifty-six".