1191434663989 has 8 divisors (see below), whose sum is σ = 1201058920448. Its totient is φ = 1181814202800.

The previous prime is 1191434663987. The next prime is 1191434664023. The reversal of 1191434663989 is 9893664341911.

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

It is a cyclic number.

It is not a de Polignac number, because 1191434663989 - 2¹ = 1191434663987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191434663989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191434663987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316737 + ... + 1575814.

It is an arithmetic number, because the mean of its divisors is an integer number (150132365056).

Almost surely, 2^{1191434663989} is an apocalyptic number.

It is an amenable number.

1191434663989 is a deficient number, since it is larger than the sum of its proper divisors (9624256459).

1191434663989 is a wasteful number, since it uses less digits than its factorization.

1191434663989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897635.

The product of its digits is 30233088, while the sum is 64.

The spelling of 1191434663989 in words is "one trillion, one hundred ninety-one billion, four hundred thirty-four million, six hundred sixty-three thousand, nine hundred eighty-nine".