494493661 has 8 divisors (see below), whose sum is σ = 506863224. Its totient is φ = 482138880.

The previous prime is 494493647. The next prime is 494493667. The reversal of 494493661 is 166394494.

It can be written as a sum of positive squares in 4 ways, for example, as 7452900 + 487040761 = 2730^2 + 22069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 494493661 - 2¹⁵ = 494460893 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 (494493667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98955 + ... + 103831.

It is an arithmetic number, because the mean of its divisors is an integer number (63357903).

Almost surely, 2^494493661 is an apocalyptic number.

494493661 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

494493661 is a deficient number, since it is larger than the sum of its proper divisors (12369563).

494493661 is a wasteful number, since it uses less digits than its factorization.

494493661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7391.

The product of its digits is 559872, while the sum is 46.

The square root of 494493661 is about 22237.2134270461. The cubic root of 494493661 is about 790.7761751487.

The spelling of 494493661 in words is "four hundred ninety-four million, four hundred ninety-three thousand, six hundred sixty-one".