490912865 has 4 divisors (see below), whose sum is σ = 589095444. Its totient is φ = 392730288.

The previous prime is 490912853. The next prime is 490912867. The reversal of 490912865 is 568219094.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152794321 + 338118544 = 12361^2 + 18388^2 .

It is a cyclic number.

It is not a de Polignac number, because 490912865 - 2⁶ = 490912801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (490912867) 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, 49091282 + ... + 49091291.

It is an arithmetic number, because the mean of its divisors is an integer number (147273861).

Almost surely, 2^490912865 is an apocalyptic number.

It is an amenable number.

490912865 is a deficient number, since it is larger than the sum of its proper divisors (98182579).

490912865 is an equidigital number, since it uses as much as digits as its factorization.

490912865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98182578.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 490912865 is about 22156.5535451703. The cubic root of 490912865 is about 788.8627898711.

The spelling of 490912865 in words is "four hundred ninety million, nine hundred twelve thousand, eight hundred sixty-five".