16989449731 has 4 divisors (see below), whose sum is σ = 16994163472. Its totient is φ = 16984735992.

The previous prime is 16989449717. The next prime is 16989449753. The reversal of 16989449731 is 13794498961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16989449731 - 2³³ = 8399515139 is a prime.

It is a super-2 number, since 2×16989449731² (a number of 21 digits) contains 22 as substring.

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 16989449731.

It is not an unprimeable number, because it can be changed into a prime (16989449761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2351460 + ... + 2358673.

It is an arithmetic number, because the mean of its divisors is an integer number (4248540868).

Almost surely, 2^16989449731 is an apocalyptic number.

16989449731 is a deficient number, since it is larger than the sum of its proper divisors (4713741).

16989449731 is an equidigital number, since it uses as much as digits as its factorization.

16989449731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4713740.

The product of its digits is 11757312, while the sum is 61.

The spelling of 16989449731 in words is "sixteen billion, nine hundred eighty-nine million, four hundred forty-nine thousand, seven hundred thirty-one".