494561721 has 32 divisors (see below), whose sum is σ = 698052096. Its totient is φ = 311040000.

The previous prime is 494561701. The next prime is 494561731. The reversal of 494561721 is 127165494.

It is not a de Polignac number, because 494561721 - 2⁵ = 494561689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 494561721.

It is not an unprimeable number, because it can be changed into a prime (494561701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1233121 + ... + 1233521.

It is an arithmetic number, because the mean of its divisors is an integer number (21814128).

Almost surely, 2^494561721 is an apocalyptic number.

494561721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

494561721 is a deficient number, since it is larger than the sum of its proper divisors (203490375).

494561721 is a wasteful number, since it uses less digits than its factorization.

494561721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its digits is 60480, while the sum is 39.

The square root of 494561721 is about 22238.7436920344. The cubic root of 494561721 is about 790.8124531719.

It can be divided in two parts, 4945 and 61721, that added together give a palindrome (66666).

The spelling of 494561721 in words is "four hundred ninety-four million, five hundred sixty-one thousand, seven hundred twenty-one".