1055521820 has 24 divisors (see below), whose sum is σ = 2333259600. Its totient is φ = 399987072.

The previous prime is 1055521807. The next prime is 1055521847. The reversal of 1055521820 is 281255501.

It is a super-2 number, since 2×1055521820² = 2228252624992224800, which 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1388465 + ... + 1389224.

It is an arithmetic number, because the mean of its divisors is an integer number (97219150).

Almost surely, 2^1055521820 is an apocalyptic number.

1055521820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1055521820 is an abundant number, since it is smaller than the sum of its proper divisors (1277737780).

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

1055521820 is a wasteful number, since it uses less digits than its factorization.

1055521820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777717 (or 2777715 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 1055521820 is about 32488.7952993028. The cubic root of 1055521820 is about 1018.1749435268.

The spelling of 1055521820 in words is "one billion, fifty-five million, five hundred twenty-one thousand, eight hundred twenty".