489513581 has 2 divisors, whose sum is σ = 489513582. Its totient is φ = 489513580.

The previous prime is 489513559. The next prime is 489513611. The reversal of 489513581 is 185315984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471280681 + 18232900 = 21709^2 + 4270^2 .

It is a cyclic number.

It is not a de Polignac number, because 489513581 - 2⁶ = 489513517 is a prime.

It is a super-2 number, since 2×489513581² = 479247091966887122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489513481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244756790 + 244756791.

It is an arithmetic number, because the mean of its divisors is an integer number (244756791).

Almost surely, 2^489513581 is an apocalyptic number.

It is an amenable number.

489513581 is a deficient number, since it is larger than the sum of its proper divisors (1).

489513581 is an equidigital number, since it uses as much as digits as its factorization.

489513581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 44.

The square root of 489513581 is about 22124.9538078614. The cubic root of 489513581 is about 788.1125592902.

It can be divided in two parts, 489513 and 581, that added together give a palindrome (490094).

The spelling of 489513581 in words is "four hundred eighty-nine million, five hundred thirteen thousand, five hundred eighty-one".