491642247 has 8 divisors (see below), whose sum is σ = 656893440. Its totient is φ = 327076280.

The previous prime is 491642219. The next prime is 491642251. The reversal of 491642247 is 742246194.

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

It is a cyclic number.

It is not a de Polignac number, because 491642247 - 2⁸ = 491641991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491642287) 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, 169629 + ... + 172502.

It is an arithmetic number, because the mean of its divisors is an integer number (82111680).

Almost surely, 2^491642247 is an apocalyptic number.

491642247 is a deficient number, since it is larger than the sum of its proper divisors (165251193).

491642247 is a wasteful number, since it uses less digits than its factorization.

491642247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342613.

The product of its digits is 96768, while the sum is 39.

The square root of 491642247 is about 22173.0071708823. The cubic root of 491642247 is about 789.2532852346.

The spelling of 491642247 in words is "four hundred ninety-one million, six hundred forty-two thousand, two hundred forty-seven".