11520381 has 4 divisors (see below), whose sum is σ = 15360512. Its totient is φ = 7680252.

The previous prime is 11520371. The next prime is 11520391. The reversal of 11520381 is 18302511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11520371) and next prime (11520391).

It is not a de Polignac number, because 11520381 - 2¹⁰ = 11519357 is a prime.

It is a super-2 number, since 2×11520381² = 265438356770322, 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 (11520331) 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, 1920061 + ... + 1920066.

It is an arithmetic number, because the mean of its divisors is an integer number (3840128).

Almost surely, 2^11520381 is an apocalyptic number.

It is an amenable number.

11520381 is a deficient number, since it is larger than the sum of its proper divisors (3840131).

11520381 is an equidigital number, since it uses as much as digits as its factorization.

11520381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840130.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 11520381 is about 3394.1686758321. The cubic root of 11520381 is about 225.8511367285.

Adding to 11520381 its reverse (18302511), we get a palindrome (29822892).

The spelling of 11520381 in words is "eleven million, five hundred twenty thousand, three hundred eighty-one".