493146721 has 4 divisors (see below), whose sum is σ = 501505200. Its totient is φ = 484788244.

The previous prime is 493146697. The next prime is 493146781. The reversal of 493146721 is 127641394.

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 493146721 - 2²¹ = 491049569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (493146781) 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, 4179151 + ... + 4179268.

It is an arithmetic number, because the mean of its divisors is an integer number (125376300).

Almost surely, 2^493146721 is an apocalyptic number.

It is an amenable number.

493146721 is a deficient number, since it is larger than the sum of its proper divisors (8358479).

493146721 is an equidigital number, since it uses as much as digits as its factorization.

493146721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8358478.

The product of its digits is 36288, while the sum is 37.

The square root of 493146721 is about 22206.9070561391. The cubic root of 493146721 is about 790.0575298595.

The spelling of 493146721 in words is "four hundred ninety-three million, one hundred forty-six thousand, seven hundred twenty-one".