489681457 has 2 divisors, whose sum is σ = 489681458. Its totient is φ = 489681456.

The previous prime is 489681427. The next prime is 489681473. The reversal of 489681457 is 754186984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489117456 + 564001 = 22116^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 489681457 - 2⁷ = 489681329 is a prime.

It is not a weakly prime, because it can be changed into another prime (489681427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244840728 + 244840729.

It is an arithmetic number, because the mean of its divisors is an integer number (244840729).

Almost surely, 2^489681457 is an apocalyptic number.

It is an amenable number.

489681457 is a deficient number, since it is larger than the sum of its proper divisors (1).

489681457 is an equidigital number, since it uses as much as digits as its factorization.

489681457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The square root of 489681457 is about 22128.7472984803. The cubic root of 489681457 is about 788.2026419543.

The spelling of 489681457 in words is "four hundred eighty-nine million, six hundred eighty-one thousand, four hundred fifty-seven".