16311989 has 8 divisors (see below), whose sum is σ = 16536960. Its totient is φ = 16088800.

The previous prime is 16311943. The next prime is 16312001. The reversal of 16311989 is 98911361.

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 16311989 - 2¹⁶ = 16246453 is a prime.

It is a super-2 number, since 2×16311989² = 532161970272242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16311929) 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, 31049 + ... + 31569.

It is an arithmetic number, because the mean of its divisors is an integer number (2067120).

Almost surely, 2^16311989 is an apocalyptic number.

It is an amenable number.

16311989 is a deficient number, since it is larger than the sum of its proper divisors (224971).

16311989 is a wasteful number, since it uses less digits than its factorization.

16311989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its digits is 11664, while the sum is 38.

The square root of 16311989 is about 4038.8103446436. The cubic root of 16311989 is about 253.6115178603.

The spelling of 16311989 in words is "sixteen million, three hundred eleven thousand, nine hundred eighty-nine".