491139919408 has 20 divisors (see below), whose sum is σ = 951595215040. Its totient is φ = 245566960704.

The previous prime is 491139919357. The next prime is 491139919409. The reversal of 491139919408 is 804919931194.

It is not an unprimeable number, because it can be changed into a prime (491139919409) 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, 1806241 + ... + 2060287.

It is an arithmetic number, because the mean of its divisors is an integer number (47579760752).

Almost surely, 2^491139919408 is an apocalyptic number.

It is an amenable number.

491139919408 is a deficient number, since it is larger than the sum of its proper divisors (460455295632).

491139919408 is a wasteful number, since it uses less digits than its factorization.

491139919408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374884 (or 374878 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 58.

The spelling of 491139919408 in words is "four hundred ninety-one billion, one hundred thirty-nine million, nine hundred nineteen thousand, four hundred eight".