1191138608 has 40 divisors (see below), whose sum is σ = 2519637840. Its totient is φ = 540995840.

The previous prime is 1191138587. The next prime is 1191138629. The reversal of 1191138608 is 8068311911.

It is an interprime number because it is at equal distance from previous prime (1191138587) and next prime (1191138629).

It is a super-2 number, since 2×1191138608² = 2837622366936355328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349778 + ... + 353166.

It is an arithmetic number, because the mean of its divisors is an integer number (62990946).

Almost surely, 2^1191138608 is an apocalyptic number.

It is an amenable number.

1191138608 is an abundant number, since it is smaller than the sum of its proper divisors (1328499232).

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

1191138608 is a wasteful number, since it uses less digits than its factorization.

1191138608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405 (or 5399 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 1191138608 is about 34512.8759740477. The cubic root of 1191138608 is about 1060.0363723131.

It can be divided in two parts, 119113 and 8608, that added together give a palindrome (127721).

The spelling of 1191138608 in words is "one billion, one hundred ninety-one million, one hundred thirty-eight thousand, six hundred eight".