1191065456 has 40 divisors (see below), whose sum is σ = 2640649440. Its totient is φ = 509819904.

The previous prime is 1191065453. The next prime is 1191065461. The reversal of 1191065456 is 6545601911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191065453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89780 + ... + 102188.

It is an arithmetic number, because the mean of its divisors is an integer number (66016236).

Almost surely, 2^1191065456 is an apocalyptic number.

1191065456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1191065456 is an abundant number, since it is smaller than the sum of its proper divisors (1449583984).

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

1191065456 is a wasteful number, since it uses less digits than its factorization.

1191065456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13281 (or 13275 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1191065456 is about 34511.8161793899. The cubic root of 1191065456 is about 1060.0146716849.

The spelling of 1191065456 in words is "one billion, one hundred ninety-one million, sixty-five thousand, four hundred fifty-six".