11155580 has 12 divisors (see below), whose sum is σ = 23426760. Its totient is φ = 4462224.

The previous prime is 11155579. The next prime is 11155583. The reversal of 11155580 is 8555111.

11155580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×11155580³ (a number of 22 digits) contains 333 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278870 + ... + 278909.

It is an arithmetic number, because the mean of its divisors is an integer number (1952230).

Almost surely, 2^11155580 is an apocalyptic number.

11155580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11155580 is an abundant number, since it is smaller than the sum of its proper divisors (12271180).

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

11155580 is a wasteful number, since it uses less digits than its factorization.

11155580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557788 (or 557786 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 26.

The square root of 11155580 is about 3339.9970059867. The cubic root of 11155580 is about 223.4416098320.

The spelling of 11155580 in words is "eleven million, one hundred fifty-five thousand, five hundred eighty".