1191623216 has 20 divisors (see below), whose sum is σ = 2638594512. Its totient is φ = 510695616.

The previous prime is 1191623201. The next prime is 1191623219. The reversal of 1191623216 is 6123261911.

It is not an unprimeable number, because it can be changed into a prime (1191623219) 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 in 3 ways as a sum of consecutive naturals, for example, 5319635 + ... + 5319858.

Almost surely, 2^1191623216 is an apocalyptic number.

1191623216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1191623216 is an abundant number, since it is smaller than the sum of its proper divisors (1446971296).

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

1191623216 is a wasteful number, since it uses less digits than its factorization.

1191623216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10639508 (or 10639502 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 1191623216 is about 34519.8959442232. The cubic root of 1191623216 is about 1060.1801094212.

The spelling of 1191623216 in words is "one billion, one hundred ninety-one million, six hundred twenty-three thousand, two hundred sixteen".