489647621 has 4 divisors (see below), whose sum is σ = 510936672. Its totient is φ = 468358572.

The previous prime is 489647593. The next prime is 489647633. The reversal of 489647621 is 126746984.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-489647621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489647681) 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, 10644491 + ... + 10644536.

It is an arithmetic number, because the mean of its divisors is an integer number (127734168).

Almost surely, 2^489647621 is an apocalyptic number.

It is an amenable number.

489647621 is a deficient number, since it is larger than the sum of its proper divisors (21289051).

489647621 is a wasteful number, since it uses less digits than its factorization.

489647621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21289050.

The product of its digits is 580608, while the sum is 47.

The square root of 489647621 is about 22127.9827593931. The cubic root of 489647621 is about 788.1844871324.

The spelling of 489647621 in words is "four hundred eighty-nine million, six hundred forty-seven thousand, six hundred twenty-one".