11731985997 has 8 divisors (see below), whose sum is σ = 15643282656. Its totient is φ = 7821006672.

The previous prime is 11731985987. The next prime is 11731986017. The reversal of 11731985997 is 79958913711.

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

It is not a de Polignac number, because 11731985997 - 2⁶ = 11731985933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11731985997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11731985927) 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, 27478 + ... + 155624.

It is an arithmetic number, because the mean of its divisors is an integer number (1955410332).

Almost surely, 2^11731985997 is an apocalyptic number.

It is an amenable number.

11731985997 is a deficient number, since it is larger than the sum of its proper divisors (3911296659).

11731985997 is a wasteful number, since it uses less digits than its factorization.

11731985997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158667.

The product of its digits is 4286520, while the sum is 60.

The spelling of 11731985997 in words is "eleven billion, seven hundred thirty-one million, nine hundred eighty-five thousand, nine hundred ninety-seven".