491259715128 has 192 divisors, whose sum is σ = 1709512308000. Its totient is φ = 129562965504.

The previous prime is 491259715123. The next prime is 491259715157. The reversal of 491259715128 is 821517952194.

491259715128 is a `hidden beast` number, since 4 + 9 + 1 + 2 + 59 + 71 + 512 + 8 = 666.

It is a super-2 number, since 2×491259715128² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491259715123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1647613 + ... + 1922796.

Almost surely, 2^491259715128 is an apocalyptic number.

It is an amenable number.

491259715128 is an abundant number, since it is smaller than the sum of its proper divisors (1218252592872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491259715128 is a wasteful number, since it uses less digits than its factorization.

491259715128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570451 (or 3570434 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 54.

The spelling of 491259715128 in words is "four hundred ninety-one billion, two hundred fifty-nine million, seven hundred fifteen thousand, one hundred twenty-eight".