1031216820 has 48 divisors (see below), whose sum is σ = 2905824768. Its totient is φ = 273237120.

The previous prime is 1031216819. The next prime is 1031216867. The reversal of 1031216820 is 286121301.

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, 45316 + ... + 64155.

It is an arithmetic number, because the mean of its divisors is an integer number (60538016).

Almost surely, 2^1031216820 is an apocalyptic number.

1031216820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031216820 is an abundant number, since it is smaller than the sum of its proper divisors (1874607948).

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

1031216820 is a wasteful number, since it uses less digits than its factorization.

1031216820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109640 (or 109638 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1031216820 is about 32112.5648306080. The cubic root of 1031216820 is about 1010.2991696176.

The spelling of 1031216820 in words is "one billion, thirty-one million, two hundred sixteen thousand, eight hundred twenty".