491995930 has 16 divisors (see below), whose sum is σ = 887301864. Its totient is φ = 196418560.

The previous prime is 491995913. The next prime is 491995939. The reversal of 491995930 is 39599194.

491995930 = 2834² + 2835² + ... + 2893².

491995930 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 304607209 + 187388721 = 17453^2 + 13689^2 .

It is not an unprimeable number, because it can be changed into a prime (491995939) 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, 42007 + ... + 52426.

Almost surely, 2^491995930 is an apocalyptic number.

491995930 is a deficient number, since it is larger than the sum of its proper divisors (395305934).

491995930 is a wasteful number, since it uses less digits than its factorization.

491995930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94961.

The product of its (nonzero) digits is 393660, while the sum is 49.

The square root of 491995930 is about 22180.9812677438. The cubic root of 491995930 is about 789.4425004346.

The spelling of 491995930 in words is "four hundred ninety-one million, nine hundred ninety-five thousand, nine hundred thirty".