1191397564 has 18 divisors (see below), whose sum is σ = 2425345440. Its totient is φ = 510598872.

The previous prime is 1191397523. The next prime is 1191397573. The reversal of 1191397564 is 4657931911.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 3039084 + ... + 3039475.

Almost surely, 2^1191397564 is an apocalyptic number.

1191397564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1191397564 is an abundant number, since it is smaller than the sum of its proper divisors (1233947876).

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

1191397564 is a wasteful number, since it uses less digits than its factorization.

1191397564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078577 (or 6078568 counting only the distinct ones).

The product of its digits is 204120, while the sum is 46.

The square root of 1191397564 is about 34516.6273555224. The cubic root of 1191397564 is about 1060.1131847811.

The spelling of 1191397564 in words is "one billion, one hundred ninety-one million, three hundred ninety-seven thousand, five hundred sixty-four".