16281971889 has 4 divisors (see below), whose sum is σ = 21709295856. Its totient is φ = 10854647924.

The previous prime is 16281971879. The next prime is 16281971917. The reversal of 16281971889 is 98817918261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98817918261 = 3 ⋅32939306087.

It is a cyclic number.

It is not a de Polignac number, because 16281971889 - 2⁸ = 16281971633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16281971879) 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 3 ways as a sum of consecutive naturals, for example, 2713661979 + ... + 2713661984.

It is an arithmetic number, because the mean of its divisors is an integer number (5427323964).

Almost surely, 2^16281971889 is an apocalyptic number.

It is an amenable number.

16281971889 is a deficient number, since it is larger than the sum of its proper divisors (5427323967).

16281971889 is an equidigital number, since it uses as much as digits as its factorization.

16281971889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5427323966.

The product of its digits is 3483648, while the sum is 60.

The spelling of 16281971889 in words is "sixteen billion, two hundred eighty-one million, nine hundred seventy-one thousand, eight hundred eighty-nine".