491251519784 has 8 divisors (see below), whose sum is σ = 921096599610. Its totient is φ = 245625759888.

The previous prime is 491251519751. The next prime is 491251519799. The reversal of 491251519784 is 487915152194.

It can be written as a sum of positive squares in only one way, i.e., 324191306884 + 167060212900 = 569378^2 + 408730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30703219979 + ... + 30703219994.

Almost surely, 2^491251519784 is an apocalyptic number.

It is an amenable number.

491251519784 is a deficient number, since it is larger than the sum of its proper divisors (429845079826).

491251519784 is a wasteful number, since it uses less digits than its factorization.

491251519784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61406439979 (or 61406439975 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 56.

The spelling of 491251519784 in words is "four hundred ninety-one billion, two hundred fifty-one million, five hundred nineteen thousand, seven hundred eighty-four".