1191218493 has 8 divisors (see below), whose sum is σ = 1639526656. Its totient is φ = 768528000.

The previous prime is 1191218489. The next prime is 1191218519. The reversal of 1191218493 is 3948121911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1191218493 - 2² = 1191218489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191218423) 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 7 ways as a sum of consecutive naturals, for example, 6404308 + ... + 6404493.

It is an arithmetic number, because the mean of its divisors is an integer number (204940832).

Almost surely, 2^1191218493 is an apocalyptic number.

It is an amenable number.

1191218493 is a deficient number, since it is larger than the sum of its proper divisors (448308163).

1191218493 is a wasteful number, since it uses less digits than its factorization.

1191218493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12808835.

The product of its digits is 15552, while the sum is 39.

The square root of 1191218493 is about 34514.0332763356. The cubic root of 1191218493 is about 1060.0600692789.

The spelling of 1191218493 in words is "one billion, one hundred ninety-one million, two hundred eighteen thousand, four hundred ninety-three".