491721424 has 20 divisors (see below), whose sum is σ = 955276036. Its totient is φ = 245198592.

The previous prime is 491721371. The next prime is 491721431. The reversal of 491721424 is 424127194.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 362217024 + 129504400 = 19032^2 + 11380^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 491721424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35229 + ... + 47164.

Almost surely, 2^491721424 is an apocalyptic number.

It is an amenable number.

491721424 is a deficient number, since it is larger than the sum of its proper divisors (463554612).

491721424 is a wasteful number, since it uses less digits than its factorization.

491721424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82774 (or 82768 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 491721424 is about 22174.7925356699. The cubic root of 491721424 is about 789.2956516460.

The spelling of 491721424 in words is "four hundred ninety-one million, seven hundred twenty-one thousand, four hundred twenty-four".