1191065136 has 40 divisors (see below), whose sum is σ = 3176177664. Its totient is φ = 384214080.

The previous prime is 1191065123. The next prime is 1191065147. The reversal of 1191065136 is 6315601911.

It is a junction number, because it is equal to n+sod(n) for n = 1191065097 and 1191065106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398736 + ... + 401711.

Almost surely, 2^1191065136 is an apocalyptic number.

1191065136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1191065136 is an abundant number, since it is smaller than the sum of its proper divisors (1985112528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1191065136 is a wasteful number, since it uses less digits than its factorization.

1191065136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800489 (or 800483 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 1191065136 is about 34511.8115432963. The cubic root of 1191065136 is about 1060.0145767546.

The spelling of 1191065136 in words is "one billion, one hundred ninety-one million, sixty-five thousand, one hundred thirty-six".