11539381 has 4 divisors (see below), whose sum is σ = 13187872. Its totient is φ = 9890892.

The previous prime is 11539357. The next prime is 11539387. The reversal of 11539381 is 18393511.

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 a cyclic number.

It is not a de Polignac number, because 11539381 - 2¹⁹ = 11015093 is a prime.

It is a super-2 number, since 2×11539381² = 266314627726322, 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 (11539387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824235 + ... + 824248.

It is an arithmetic number, because the mean of its divisors is an integer number (3296968).

Almost surely, 2^11539381 is an apocalyptic number.

It is an amenable number.

11539381 is a deficient number, since it is larger than the sum of its proper divisors (1648491).

11539381 is an equidigital number, since it uses as much as digits as its factorization.

11539381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648490.

The product of its digits is 3240, while the sum is 31.

The square root of 11539381 is about 3396.9664408116. The cubic root of 11539381 is about 225.9752302715.

The spelling of 11539381 in words is "eleven million, five hundred thirty-nine thousand, three hundred eighty-one".