1051815856 has 80 divisors (see below), whose sum is σ = 2526963264. Its totient is φ = 412987392.

The previous prime is 1051815803. The next prime is 1051815859. The reversal of 1051815856 is 6585181501.

It is a super-2 number, since 2×1051815856² = 2212633189866025472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1051815859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196836 + ... + 202108.

Almost surely, 2^1051815856 is an apocalyptic number.

1051815856 is a gapful number since it is divisible by the number (16) 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 1051815856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263481632).

1051815856 is an abundant number, since it is smaller than the sum of its proper divisors (1475147408).

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

1051815856 is a wasteful number, since it uses less digits than its factorization.

1051815856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438 (or 5432 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 40.

The square root of 1051815856 is about 32431.7106548514. The cubic root of 1051815856 is about 1016.9819334841.

The spelling of 1051815856 in words is "one billion, fifty-one million, eight hundred fifteen thousand, eight hundred fifty-six".