491071907 has 4 divisors (see below), whose sum is σ = 496988520. Its totient is φ = 485155296.

The previous prime is 491071901. The next prime is 491071939. The reversal of 491071907 is 709170194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491071907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491071901) 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, 2958182 + ... + 2958347.

It is an arithmetic number, because the mean of its divisors is an integer number (124247130).

Almost surely, 2^491071907 is an apocalyptic number.

491071907 is a deficient number, since it is larger than the sum of its proper divisors (5916613).

491071907 is an equidigital number, since it uses as much as digits as its factorization.

491071907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5916612.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 491071907 is about 22160.1423054998. The cubic root of 491071907 is about 788.9479704794.

The spelling of 491071907 in words is "four hundred ninety-one million, seventy-one thousand, nine hundred seven".