491530786 has 8 divisors (see below), whose sum is σ = 737520300. Its totient is φ = 245690688.

The previous prime is 491530783. The next prime is 491530801. The reversal of 491530786 is 687035194.

It can be written as a sum of positive squares in 2 ways, for example, as 476592561 + 14938225 = 21831^2 + 3865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (491530783) 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, 28731 + ... + 42526.

Almost surely, 2^491530786 is an apocalyptic number.

491530786 is a deficient number, since it is larger than the sum of its proper divisors (245989514).

491530786 is a wasteful number, since it uses less digits than its factorization.

491530786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74708.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 491530786 is about 22170.4935894535. The cubic root of 491530786 is about 789.1936364352.

The spelling of 491530786 in words is "four hundred ninety-one million, five hundred thirty thousand, seven hundred eighty-six".