11851381 has 4 divisors (see below), whose sum is σ = 11877772. Its totient is φ = 11824992.

The previous prime is 11851373. The next prime is 11851403. The reversal of 11851381 is 18315811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6584356 + 5267025 = 2566^2 + 2295^2 .

It is a cyclic number.

It is not a de Polignac number, because 11851381 - 2³ = 11851373 is a prime.

It is a super-2 number, since 2×11851381² = 280910463214322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11851351) 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, 12510 + ... + 13423.

It is an arithmetic number, because the mean of its divisors is an integer number (2969443).

Almost surely, 2^11851381 is an apocalyptic number.

It is an amenable number.

11851381 is a deficient number, since it is larger than the sum of its proper divisors (26391).

11851381 is an equidigital number, since it uses as much as digits as its factorization.

11851381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26390.

The product of its digits is 960, while the sum is 28.

The square root of 11851381 is about 3442.5834775645. The cubic root of 11851381 is about 227.9937735552.

The spelling of 11851381 in words is "eleven million, eight hundred fifty-one thousand, three hundred eighty-one".