489610991 has 4 divisors (see below), whose sum is σ = 489681192. Its totient is φ = 489540792.

The previous prime is 489610987. The next prime is 489611039. The reversal of 489610991 is 199016984.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 489610991 - 2² = 489610987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489610091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23321 + ... + 39026.

It is an arithmetic number, because the mean of its divisors is an integer number (122420298).

Almost surely, 2^489610991 is an apocalyptic number.

489610991 is a deficient number, since it is larger than the sum of its proper divisors (70201).

489610991 is an equidigital number, since it uses as much as digits as its factorization.

489610991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70200.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 489610991 is about 22127.1550588864. The cubic root of 489610991 is about 788.1648322374.

The spelling of 489610991 in words is "four hundred eighty-nine million, six hundred ten thousand, nine hundred ninety-one".