489117661 has 2 divisors, whose sum is σ = 489117662. Its totient is φ = 489117660.

The previous prime is 489117653. The next prime is 489117691. The reversal of 489117661 is 166711984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400400100 + 88717561 = 20010^2 + 9419^2 .

It is a cyclic number.

It is not a de Polignac number, because 489117661 - 2³ = 489117653 is a prime.

It is a super-2 number, since 2×489117661² = 478472172604221842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489117691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244558830 + 244558831.

It is an arithmetic number, because the mean of its divisors is an integer number (244558831).

Almost surely, 2^489117661 is an apocalyptic number.

It is an amenable number.

489117661 is a deficient number, since it is larger than the sum of its proper divisors (1).

489117661 is an equidigital number, since it uses as much as digits as its factorization.

489117661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 489117661 is about 22116.0046346532. The cubic root of 489117661 is about 787.9000260750.

The spelling of 489117661 in words is "four hundred eighty-nine million, one hundred seventeen thousand, six hundred sixty-one".