1091911012 has 6 divisors (see below), whose sum is σ = 1910844278. Its totient is φ = 545955504.

The previous prime is 1091911001. The next prime is 1091911013. The reversal of 1091911012 is 2101191901.

It can be written as a sum of positive squares in only one way, i.e., 1091245156 + 665856 = 33034^2 + 816^2 .

It is not an unprimeable number, because it can be changed into a prime (1091911013) 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, 136488873 + ... + 136488880.

Almost surely, 2^1091911012 is an apocalyptic number.

It is an amenable number.

1091911012 is a deficient number, since it is larger than the sum of its proper divisors (818933266).

1091911012 is a wasteful number, since it uses less digits than its factorization.

1091911012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272977757 (or 272977755 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 25.

The square root of 1091911012 is about 33044.0768065927. The cubic root of 1091911012 is about 1029.7435538392.

The spelling of 1091911012 in words is "one billion, ninety-one million, nine hundred eleven thousand, twelve".