1081158540 has 288 divisors, whose sum is σ = 3891379968. Its totient is φ = 221760000.

The previous prime is 1081158509. The next prime is 1081158553. The reversal of 1081158540 is 458511801.

It is a super-2 number, since 2×1081158540² = 2337807577229863200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3266175 + ... + 3266505.

It is an arithmetic number, because the mean of its divisors is an integer number (13511736).

Almost surely, 2^1081158540 is an apocalyptic number.

1081158540 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 1081158540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1945689984).

1081158540 is an abundant number, since it is smaller than the sum of its proper divisors (2810221428).

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

1081158540 is a wasteful number, since it uses less digits than its factorization.

1081158540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 33.

The square root of 1081158540 is about 32880.9753504971. The cubic root of 1081158540 is about 1026.3523027419.

The spelling of 1081158540 in words is "one billion, eighty-one million, one hundred fifty-eight thousand, five hundred forty".