11781369 has 16 divisors (see below), whose sum is σ = 17672640. Its totient is φ = 7852788.

The previous prime is 11781361. The next prime is 11781377. The reversal of 11781369 is 96318711.

It is an interprime number because it is at equal distance from previous prime (11781361) and next prime (11781377).

It is not a de Polignac number, because 11781369 - 2³ = 11781361 is a prime.

It is a super-2 number, since 2×11781369² = 277601311028322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11781361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507 + ... + 4880.

It is an arithmetic number, because the mean of its divisors is an integer number (1104540).

Almost surely, 2^11781369 is an apocalyptic number.

It is an amenable number.

11781369 is a deficient number, since it is larger than the sum of its proper divisors (5891271).

11781369 is an frugal number, since it uses more digits than its factorization.

11781369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408 (or 5390 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11781369 is about 3432.3998892903. The cubic root of 11781369 is about 227.5439290447.

The spelling of 11781369 in words is "eleven million, seven hundred eighty-one thousand, three hundred sixty-nine".