491806239 has 8 divisors (see below), whose sum is σ = 668114352. Its totient is φ = 321684480.

The previous prime is 491806229. The next prime is 491806253. The reversal of 491806239 is 932608194.

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

It is not a de Polignac number, because 491806239 - 2¹¹ = 491804191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491806239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491806219) 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, 1546402 + ... + 1546719.

It is an arithmetic number, because the mean of its divisors is an integer number (83514294).

Almost surely, 2^491806239 is an apocalyptic number.

491806239 is a deficient number, since it is larger than the sum of its proper divisors (176308113).

491806239 is a wasteful number, since it uses less digits than its factorization.

491806239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093177.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 491806239 is about 22176.7048724557. The cubic root of 491806239 is about 789.3410298207.

The spelling of 491806239 in words is "four hundred ninety-one million, eight hundred six thousand, two hundred thirty-nine".