491130391 has 16 divisors (see below), whose sum is σ = 538164000. Its totient is φ = 446358528.

The previous prime is 491130389. The next prime is 491130407. The reversal of 491130391 is 193031194.

It is not a de Polignac number, because 491130391 - 2¹ = 491130389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491130361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61285 + ... + 68833.

It is an arithmetic number, because the mean of its divisors is an integer number (33635250).

Almost surely, 2^491130391 is an apocalyptic number.

491130391 is a deficient number, since it is larger than the sum of its proper divisors (47033609).

491130391 is a wasteful number, since it uses less digits than its factorization.

491130391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7698.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 491130391 is about 22161.4618425771. The cubic root of 491130391 is about 788.9792890439.

The spelling of 491130391 in words is "four hundred ninety-one million, one hundred thirty thousand, three hundred ninety-one".