1191664916 has 12 divisors (see below), whose sum is σ = 2245830132. Its totient is φ = 549999168.

The previous prime is 1191664913. The next prime is 1191664939. The reversal of 1191664916 is 6194661911.

It can be written as a sum of positive squares in 2 ways, for example, as 508051600 + 683613316 = 22540^2 + 26146^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191664913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11458265 + ... + 11458368.

It is an arithmetic number, because the mean of its divisors is an integer number (187152511).

Almost surely, 2^1191664916 is an apocalyptic number.

It is an amenable number.

1191664916 is a deficient number, since it is larger than the sum of its proper divisors (1054165216).

1191664916 is a wasteful number, since it uses less digits than its factorization.

1191664916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22916650 (or 22916648 counting only the distinct ones).

The product of its digits is 69984, while the sum is 44.

The square root of 1191664916 is about 34520.4999384424. The cubic root of 1191664916 is about 1060.1924760245.

The spelling of 1191664916 in words is "one billion, one hundred ninety-one million, six hundred sixty-four thousand, nine hundred sixteen".