11081540 has 12 divisors (see below), whose sum is σ = 23271276. Its totient is φ = 4432608.

The previous prime is 11081527. The next prime is 11081563. The reversal of 11081540 is 4518011.

It can be written as a sum of positive squares in 2 ways, for example, as 2033476 + 9048064 = 1426^2 + 3008^2 .

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: 554077 = 11081540 / (1 + 1 + 0 + 8 + 1 + 5 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277019 + ... + 277058.

It is an arithmetic number, because the mean of its divisors is an integer number (1939273).

Almost surely, 2^11081540 is an apocalyptic number.

11081540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11081540 is an abundant number, since it is smaller than the sum of its proper divisors (12189736).

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

11081540 is a wasteful number, since it uses less digits than its factorization.

11081540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554086 (or 554084 counting only the distinct ones).

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

The square root of 11081540 is about 3328.8947114620. The cubic root of 11081540 is about 222.9461820566.

Adding to 11081540 its reverse (4518011), we get a palindrome (15599551).

The spelling of 11081540 in words is "eleven million, eighty-one thousand, five hundred forty".