1081555140 has 48 divisors (see below), whose sum is σ = 3110208192. Its totient is φ = 280619136.

The previous prime is 1081555133. The next prime is 1081555169. The reversal of 1081555140 is 415551801.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1081555098 and 1081555107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241374 + ... + 245813.

It is an arithmetic number, because the mean of its divisors is an integer number (64796004).

Almost surely, 2^1081555140 is an apocalyptic number.

1081555140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081555140 is an abundant number, since it is smaller than the sum of its proper divisors (2028653052).

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

1081555140 is a wasteful number, since it uses less digits than its factorization.

1081555140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487236 (or 487234 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 30.

The square root of 1081555140 is about 32887.0056405262. The cubic root of 1081555140 is about 1026.4777858990.

The spelling of 1081555140 in words is "one billion, eighty-one million, five hundred fifty-five thousand, one hundred forty".