11131780 has 24 divisors (see below), whose sum is σ = 25502400. Its totient is φ = 4047840.

The previous prime is 11131751. The next prime is 11131789. The reversal of 11131780 is 8713111.

11131780 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 3×11131780³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (11131789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25080 + ... + 25519.

It is an arithmetic number, because the mean of its divisors is an integer number (1062600).

Almost surely, 2^11131780 is an apocalyptic number.

11131780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11131780 is an abundant number, since it is smaller than the sum of its proper divisors (14370620).

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

11131780 is a wasteful number, since it uses less digits than its factorization.

11131780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50619 (or 50617 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 11131780 is about 3336.4322261961. The cubic root of 11131780 is about 223.2825953401.

Adding to 11131780 its reverse (8713111), we get a palindrome (19844891).

It can be divided in two parts, 11131 and 780, that added together give a palindrome (11911).

The spelling of 11131780 in words is "eleven million, one hundred thirty-one thousand, seven hundred eighty".