489001621 has 2 divisors, whose sum is σ = 489001622. Its totient is φ = 489001620.

The previous prime is 489001609. The next prime is 489001631. The reversal of 489001621 is 126100984.

489001621 = T₁₈₀₅₄ + T₁₈₀₅₅ + T₁₈₀₅₆.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 457360996 + 31640625 = 21386^2 + 5625^2 .

It is a cyclic number.

It is not a de Polignac number, because 489001621 - 2⁵ = 489001589 is a prime.

It is equal to p_25806316 and since 489001621 and 25806316 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489001631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244500810 + 244500811.

It is an arithmetic number, because the mean of its divisors is an integer number (244500811).

Almost surely, 2^489001621 is an apocalyptic number.

489001621 is the 18056-th centered triangular number.

It is an amenable number.

489001621 is a deficient number, since it is larger than the sum of its proper divisors (1).

489001621 is an equidigital number, since it uses as much as digits as its factorization.

489001621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 489001621 is about 22113.3810395426. The cubic root of 489001621 is about 787.8377130860.

The spelling of 489001621 in words is "four hundred eighty-nine million, one thousand, six hundred twenty-one".