16424729281 has 3 divisors (see below), whose sum is σ = 16424857441. Its totient is φ = 16424601122.

The previous prime is 16424729267. The next prime is 16424729291. The reversal of 16424729281 is 18292742461.

The square root of 16424729281 is 128159.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 16424729281 - 2⁹ = 16424728769 is a prime.

It is a super-2 number, since 2×16424729281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16424729261) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 64080 + ... + 192238.

Almost surely, 2^16424729281 is an apocalyptic number.

16424729281 is the 128159-th square number.

16424729281 is the 64080-th centered octagonal number.

It is an amenable number.

16424729281 is a deficient number, since it is larger than the sum of its proper divisors (128160).

16424729281 is an frugal number, since it uses more digits than its factorization.

16424729281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256318 (or 128159 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The spelling of 16424729281 in words is "sixteen billion, four hundred twenty-four million, seven hundred twenty-nine thousand, two hundred eighty-one".