491053800671 has 4 divisors (see below), whose sum is σ = 561204343632. Its totient is φ = 420903257712.

The previous prime is 491053800661. The next prime is 491053800683. The reversal of 491053800671 is 176008350194.

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

It is a de Polignac number, because none of the positive numbers 2^k-491053800671 is a prime.

It is a super-2 number, since 2×491053800671² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491053800661) 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, 35075271470 + ... + 35075271483.

It is an arithmetic number, because the mean of its divisors is an integer number (140301085908).

Almost surely, 2^491053800671 is an apocalyptic number.

491053800671 is a deficient number, since it is larger than the sum of its proper divisors (70150542961).

491053800671 is an equidigital number, since it uses as much as digits as its factorization.

491053800671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70150542960.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 491053800671 in words is "four hundred ninety-one billion, fifty-three million, eight hundred thousand, six hundred seventy-one".