621654489 has 9 divisors (see below), whose sum is σ = 898053429. Its totient is φ = 414386460.

The previous prime is 621654463. The next prime is 621654493. The reversal of 621654489 is 984456126.

The square root of 621654489 is 24933.

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

621654489 is a `hidden beast` number, since 6 + 2 + 165 + 4 + 489 = 666.

621654489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 621654489 - 2⁷ = 621654361 is a prime.

It is a super-2 number, since 2×621654489² = 772908607387702242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621650489) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 70644 + ... + 78954.

Almost surely, 2^621654489 is an apocalyptic number.

621654489 is the 24933-rd square number.

621654489 is the 12467-th centered octagonal number.

It is an amenable number.

621654489 is a deficient number, since it is larger than the sum of its proper divisors (276398940).

621654489 is an frugal number, since it uses more digits than its factorization.

621654489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16628 (or 8314 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The cubic root of 621654489 is about 853.4597116936.

The spelling of 621654489 in words is "six hundred twenty-one million, six hundred fifty-four thousand, four hundred eighty-nine".