1056811900 has 72 divisors (see below), whose sum is σ = 2358849024. Its totient is φ = 410726400.

The previous prime is 1056811897. The next prime is 1056811909. The reversal of 1056811900 is 91186501.

It is a super-2 number, since 2×1056811900² = 2233702783963220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056811909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1569964 + ... + 1570636.

It is an arithmetic number, because the mean of its divisors is an integer number (32761792).

Almost surely, 2^1056811900 is an apocalyptic number.

1056811900 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 1056811900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179424512).

1056811900 is an abundant number, since it is smaller than the sum of its proper divisors (1302037124).

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

1056811900 is a wasteful number, since it uses less digits than its factorization.

1056811900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 1056811900 is about 32508.6434660076. The cubic root of 1056811900 is about 1018.5895859433.

The spelling of 1056811900 in words is "one billion, fifty-six million, eight hundred eleven thousand, nine hundred".