1081631840 has 48 divisors (see below), whose sum is σ = 2580203808. Its totient is φ = 428445696.

The previous prime is 1081631801. The next prime is 1081631861. The reversal of 1081631840 is 481361801.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1081631797 and 1081631806.

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, 16337 + ... + 49296.

It is an arithmetic number, because the mean of its divisors is an integer number (53754246).

Almost surely, 2^1081631840 is an apocalyptic number.

1081631840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081631840 is an abundant number, since it is smaller than the sum of its proper divisors (1498571968).

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

1081631840 is a wasteful number, since it uses less digits than its factorization.

1081631840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65751 (or 65743 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1081631840 is about 32888.1717339228. The cubic root of 1081631840 is about 1026.5020500295.

The spelling of 1081631840 in words is "one billion, eighty-one million, six hundred thirty-one thousand, eight hundred forty".