11381521 has 2 divisors, whose sum is σ = 11381522. Its totient is φ = 11381520.

The previous prime is 11381507. The next prime is 11381537. The reversal of 11381521 is 12518311.

11381521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11316496 + 65025 = 3364^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 11381521 - 2⁷ = 11381393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11381492 and 11381501.

It is not a weakly prime, because it can be changed into another prime (11381561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5690760 + 5690761.

It is an arithmetic number, because the mean of its divisors is an integer number (5690761).

Almost surely, 2^11381521 is an apocalyptic number.

It is an amenable number.

11381521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11381521 is an equidigital number, since it uses as much as digits as its factorization.

11381521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 22.

The square root of 11381521 is about 3373.6509896550. The cubic root of 11381521 is about 224.9400399898.

Adding to 11381521 its reverse (12518311), we get a palindrome (23899832).

The spelling of 11381521 in words is "eleven million, three hundred eighty-one thousand, five hundred twenty-one".