493668781 has 4 divisors (see below), whose sum is σ = 493826112. Its totient is φ = 493511452.

The previous prime is 493668779. The next prime is 493668787. The reversal of 493668781 is 187866394.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 493668781 - 2¹ = 493668779 is a prime.

It is a super-2 number, since 2×493668781² = 487417730668051922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493668787) 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 in 3 ways as a sum of consecutive naturals, for example, 73861 + ... + 80266.

It is an arithmetic number, because the mean of its divisors is an integer number (123456528).

Almost surely, 2^493668781 is an apocalyptic number.

It is an amenable number.

493668781 is a deficient number, since it is larger than the sum of its proper divisors (157331).

493668781 is a wasteful number, since it uses less digits than its factorization.

493668781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157330.

The product of its digits is 1741824, while the sum is 52.

The square root of 493668781 is about 22218.6583978421. The cubic root of 493668781 is about 790.3362244517.

The spelling of 493668781 in words is "four hundred ninety-three million, six hundred sixty-eight thousand, seven hundred eighty-one".