1491491478120 has 512 divisors, whose sum is σ = 5424244531200. Its totient is φ = 320495616000.

The previous prime is 1491491478119. The next prime is 1491491478143. The reversal of 1491491478120 is 218741941941.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1542389877 + ... + 1542390843.

It is an arithmetic number, because the mean of its divisors is an integer number (10594227600).

Almost surely, 2^{1491491478120} is an apocalyptic number.

1491491478120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491491478120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2712122265600).

1491491478120 is an abundant number, since it is smaller than the sum of its proper divisors (3932753053080).

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

1491491478120 is a wasteful number, since it uses less digits than its factorization.

1491491478120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 1491491478120 in words is "one trillion, four hundred ninety-one billion, four hundred ninety-one million, four hundred seventy-eight thousand, one hundred twenty".