489127721 has 4 divisors (see below), whose sum is σ = 489177744. Its totient is φ = 489077700.

The previous prime is 489127699. The next prime is 489127783. The reversal of 489127721 is 127721984.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 489127721 - 2¹⁸ = 488865577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (489127421) 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, 5015 + ... + 31676.

It is an arithmetic number, because the mean of its divisors is an integer number (122294436).

Almost surely, 2^489127721 is an apocalyptic number.

It is an amenable number.

489127721 is a deficient number, since it is larger than the sum of its proper divisors (50023).

489127721 is a wasteful number, since it uses less digits than its factorization.

489127721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50022.

The product of its digits is 56448, while the sum is 41.

The square root of 489127721 is about 22116.2320705856. The cubic root of 489127721 is about 787.9054277882.

The spelling of 489127721 in words is "four hundred eighty-nine million, one hundred twenty-seven thousand, seven hundred twenty-one".