10811540 has 12 divisors (see below), whose sum is σ = 22704276. Its totient is φ = 4324608.

The previous prime is 10811539. The next prime is 10811543. The reversal of 10811540 is 4511801.

It can be written as a sum of positive squares in 2 ways, for example, as 6739216 + 4072324 = 2596^2 + 2018^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 540577 = 10811540 / (1 + 0 + 8 + 1 + 1 + 5 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10811543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270269 + ... + 270308.

It is an arithmetic number, because the mean of its divisors is an integer number (1892023).

Almost surely, 2^10811540 is an apocalyptic number.

10811540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10811540 is an abundant number, since it is smaller than the sum of its proper divisors (11892736).

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

10811540 is a wasteful number, since it uses less digits than its factorization.

10811540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540586 (or 540584 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 10811540 is about 3288.0906313543. The cubic root of 10811540 is about 221.1205910115.

The spelling of 10811540 in words is "ten million, eight hundred eleven thousand, five hundred forty".