11781144 has 24 divisors (see below), whose sum is σ = 31907460. Its totient is φ = 3927024.

The previous prime is 11781139. The next prime is 11781149. The reversal of 11781144 is 44118711.

It is an interprime number because it is at equal distance from previous prime (11781139) and next prime (11781149).

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781149) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81742 + ... + 81885.

Almost surely, 2^11781144 is an apocalyptic number.

It is an amenable number.

11781144 is an abundant number, since it is smaller than the sum of its proper divisors (20126316).

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

11781144 is a wasteful number, since it uses less digits than its factorization.

11781144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163639 (or 163632 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 11781144 is about 3432.3671132325. The cubic root of 11781144 is about 227.5424804946.

Adding to 11781144 its reverse (44118711), we get a palindrome (55899855).

It can be divided in two parts, 117811 and 44, that added together give a triangular number (117855 = T₄₈₅).

The spelling of 11781144 in words is "eleven million, seven hundred eighty-one thousand, one hundred forty-four".