1198801187 has 4 divisors (see below), whose sum is σ = 1199923680. Its totient is φ = 1197678696.

The previous prime is 1198801169. The next prime is 1198801199. The reversal of 1198801187 is 7811088911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7811088911 = 12799 ⋅610289.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1198801187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198801157) 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, 559643 + ... + 561780.

It is an arithmetic number, because the mean of its divisors is an integer number (299980920).

Almost surely, 2^1198801187 is an apocalyptic number.

1198801187 is a deficient number, since it is larger than the sum of its proper divisors (1122493).

1198801187 is a wasteful number, since it uses less digits than its factorization.

1198801187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122492.

The product of its (nonzero) digits is 32256, while the sum is 44.

The square root of 1198801187 is about 34623.7084524463. The cubic root of 1198801187 is about 1062.3045821365.

The spelling of 1198801187 in words is "one billion, one hundred ninety-eight million, eight hundred one thousand, one hundred eighty-seven".