1019109281820 has 48 divisors (see below), whose sum is σ = 3261149703168. Its totient is φ = 232939264320.

The previous prime is 1019109281783. The next prime is 1019109281849. The reversal of 1019109281820 is 281829019101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1213224916 + ... + 1213225755.

It is an arithmetic number, because the mean of its divisors is an integer number (67940618816).

Almost surely, 2^{1019109281820} is an apocalyptic number.

1019109281820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1019109281820 is an abundant number, since it is smaller than the sum of its proper divisors (2242040421348).

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

1019109281820 is a wasteful number, since it uses less digits than its factorization.

1019109281820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426450690 (or 2426450688 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 42.

The spelling of 1019109281820 in words is "one trillion, nineteen billion, one hundred nine million, two hundred eighty-one thousand, eight hundred twenty".