491139919407 has 16 divisors (see below), whose sum is σ = 656703393120. Its totient is φ = 326502758400.

The previous prime is 491139919357. The next prime is 491139919409. The reversal of 491139919407 is 704919931194.

It is not a de Polignac number, because 491139919407 - 2¹⁰ = 491139918383 is a prime.

It is a super-2 number, since 2×491139919407² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1453407 + ... + 1759167.

It is an arithmetic number, because the mean of its divisors is an integer number (41043962070).

Almost surely, 2^491139919407 is an apocalyptic number.

491139919407 is a deficient number, since it is larger than the sum of its proper divisors (165563473713).

491139919407 is a wasteful number, since it uses less digits than its factorization.

491139919407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307274.

The product of its (nonzero) digits is 2204496, while the sum is 57.

The spelling of 491139919407 in words is "four hundred ninety-one billion, one hundred thirty-nine million, nine hundred nineteen thousand, four hundred seven".