491074276221 has 12 divisors (see below), whose sum is σ = 709362801472. Its totient is φ = 327367485576.

The previous prime is 491074276213. The next prime is 491074276229. The reversal of 491074276221 is 122672470194.

491074276221 is a `hidden beast` number, since 4 + 9 + 10 + 7 + 4 + 2 + 7 + 622 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (491074276213) and next prime (491074276229).

It is not a de Polignac number, because 491074276221 - 2³ = 491074276213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491074276229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1076311 + ... + 1463076.

Almost surely, 2^491074276221 is an apocalyptic number.

It is an amenable number.

491074276221 is a deficient number, since it is larger than the sum of its proper divisors (218288525251).

491074276221 is a wasteful number, since it uses less digits than its factorization.

491074276221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560880 (or 2560877 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 491074276221 in words is "four hundred ninety-one billion, seventy-four million, two hundred seventy-six thousand, two hundred twenty-one".