491542139449 has 8 divisors (see below), whose sum is σ = 520633522080. Its totient is φ = 462470438976.

The previous prime is 491542139437. The next prime is 491542139509. The reversal of 491542139449 is 944931245194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491542139449 - 2⁷ = 491542139321 is a prime.

It is a super-2 number, since 2×491542139449² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491542139449.

It is not an unprimeable number, because it can be changed into a prime (491542139549) 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 7 ways as a sum of consecutive naturals, for example, 4869099 + ... + 4969024.

It is an arithmetic number, because the mean of its divisors is an integer number (65079190260).

Almost surely, 2^491542139449 is an apocalyptic number.

It is an amenable number.

491542139449 is a deficient number, since it is larger than the sum of its proper divisors (29091382631).

491542139449 is a wasteful number, since it uses less digits than its factorization.

491542139449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9841079.

The product of its digits is 5598720, while the sum is 55.

The spelling of 491542139449 in words is "four hundred ninety-one billion, five hundred forty-two million, one hundred thirty-nine thousand, four hundred forty-nine".