1081001856 has 64 divisors (see below), whose sum is σ = 3132460800. Its totient is φ = 327575040.

The previous prime is 1081001821. The next prime is 1081001861. The reversal of 1081001856 is 6581001801.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123736 + ... + 132183.

It is an arithmetic number, because the mean of its divisors is an integer number (48944700).

Almost surely, 2^1081001856 is an apocalyptic number.

1081001856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1081001856 is an abundant number, since it is smaller than the sum of its proper divisors (2051458944).

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

1081001856 is a wasteful number, since it uses less digits than its factorization.

1081001856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255947 (or 255935 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 1081001856 is about 32878.5926706117. The cubic root of 1081001856 is about 1026.3027198956.

Subtracting 1081001856 from its reverse (6581001801), we obtain a palindrome (5499999945).

The spelling of 1081001856 in words is "one billion, eighty-one million, one thousand, eight hundred fifty-six".