1191381604 has 12 divisors (see below), whose sum is σ = 2382763264. Its totient is φ = 510592104.

The previous prime is 1191381601. The next prime is 1191381613. The reversal of 1191381604 is 4061831911.

1191381604 is an admirable number.

It is a super-2 number, since 2×1191381604² = 2838780252699225632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1191381604.

It is not an unprimeable number, because it can be changed into a prime (1191381601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21274644 + ... + 21274699.

Almost surely, 2^1191381604 is an apocalyptic number.

1191381604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1191381604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1191381604 is a wasteful number, since it uses less digits than its factorization.

1191381604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42549354 (or 42549352 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1191381604 is about 34516.3961618243. The cubic root of 1191381604 is about 1060.1084509899.

The spelling of 1191381604 in words is "one billion, one hundred ninety-one million, three hundred eighty-one thousand, six hundred four".