1091557136 has 10 divisors (see below), whose sum is σ = 2114891982. Its totient is φ = 545778560.

The previous prime is 1091557133. The next prime is 1091557147. The reversal of 1091557136 is 6317551901.

It can be written as a sum of positive squares in only one way, i.e., 1085307136 + 6250000 = 32944^2 + 2500^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1091557136.

It is not an unprimeable number, because it can be changed into a prime (1091557133) 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 as a sum of consecutive naturals, namely, 34111145 + ... + 34111176.

Almost surely, 2^1091557136 is an apocalyptic number.

1091557136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1091557136 is a deficient number, since it is larger than the sum of its proper divisors (1023334846).

1091557136 is an equidigital number, since it uses as much as digits as its factorization.

1091557136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68222329 (or 68222323 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 1091557136 is about 33038.7217670418. The cubic root of 1091557136 is about 1029.6322990761.

The spelling of 1091557136 in words is "one billion, ninety-one million, five hundred fifty-seven thousand, one hundred thirty-six".