491542139472 has 40 divisors (see below), whose sum is σ = 1269842760576. Its totient is φ = 163844080896.

The previous prime is 491542139437. The next prime is 491542139509. The reversal of 491542139472 is 274931245194.

It is a super-2 number, since 2×491542139472² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3942148 + ... + 4064924.

Almost surely, 2^491542139472 is an apocalyptic number.

It is an amenable number.

491542139472 is an abundant number, since it is smaller than the sum of its proper divisors (778300621104).

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

491542139472 is a wasteful number, since it uses less digits than its factorization.

491542139472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206195 (or 206189 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 491542139472 in words is "four hundred ninety-one billion, five hundred forty-two million, one hundred thirty-nine thousand, four hundred seventy-two".