11694431721 has 8 divisors (see below), whose sum is σ = 17820086464. Its totient is φ = 6682532400.

The previous prime is 11694431687. The next prime is 11694431773. The reversal of 11694431721 is 12713449611.

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

It is not a de Polignac number, because 11694431721 - 2¹³ = 11694423529 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 11694431721.

It is not an unprimeable number, because it can be changed into a prime (11694431321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278438830 + ... + 278438871.

It is an arithmetic number, because the mean of its divisors is an integer number (2227510808).

Almost surely, 2^11694431721 is an apocalyptic number.

It is an amenable number.

11694431721 is a deficient number, since it is larger than the sum of its proper divisors (6125654743).

11694431721 is an equidigital number, since it uses as much as digits as its factorization.

11694431721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556877711.

The product of its digits is 36288, while the sum is 39.

The spelling of 11694431721 in words is "eleven billion, six hundred ninety-four million, four hundred thirty-one thousand, seven hundred twenty-one".