491494956247 has 4 divisors (see below), whose sum is σ = 491876256960. Its totient is φ = 491113655536.

The previous prime is 491494956181. The next prime is 491494956259. The reversal of 491494956247 is 742659494194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742659494194 = 2 ⋅371329747097.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491494956247 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 (491494953247) 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, 190648423 + ... + 190651000.

It is an arithmetic number, because the mean of its divisors is an integer number (122969064240).

Almost surely, 2^491494956247 is an apocalyptic number.

491494956247 is a deficient number, since it is larger than the sum of its proper divisors (381300713).

491494956247 is a wasteful number, since it uses less digits than its factorization.

491494956247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381300712.

The product of its digits is 78382080, while the sum is 64.

The spelling of 491494956247 in words is "four hundred ninety-one billion, four hundred ninety-four million, nine hundred fifty-six thousand, two hundred forty-seven".