491780291 has 8 divisors (see below), whose sum is σ = 497014464. Its totient is φ = 486573480.

The previous prime is 491780243. The next prime is 491780309. The reversal of 491780291 is 192087194.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491780291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491750291) 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, 30356 + ... + 43646.

It is an arithmetic number, because the mean of its divisors is an integer number (62126808).

Almost surely, 2^491780291 is an apocalyptic number.

491780291 is a deficient number, since it is larger than the sum of its proper divisors (5234173).

491780291 is a wasteful number, since it uses less digits than its factorization.

491780291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13681.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 491780291 is about 22176.1198364367. The cubic root of 491780291 is about 789.3271475370.

The spelling of 491780291 in words is "four hundred ninety-one million, seven hundred eighty thousand, two hundred ninety-one".