489213581 has 2 divisors, whose sum is σ = 489213582. Its totient is φ = 489213580.

The previous prime is 489213563. The next prime is 489213587. The reversal of 489213581 is 185312984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487084900 + 2128681 = 22070^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 489213581 - 2²² = 485019277 is a prime.

It is a super-2 number, since 2×489213581² = 478659855669687122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489213587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244606790 + 244606791.

It is an arithmetic number, because the mean of its divisors is an integer number (244606791).

Almost surely, 2^489213581 is an apocalyptic number.

It is an amenable number.

489213581 is a deficient number, since it is larger than the sum of its proper divisors (1).

489213581 is an equidigital number, since it uses as much as digits as its factorization.

489213581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 489213581 is about 22118.1730936350. The cubic root of 489213581 is about 787.9515272690.

The spelling of 489213581 in words is "four hundred eighty-nine million, two hundred thirteen thousand, five hundred eighty-one".