11381621 has 2 divisors, whose sum is σ = 11381622. Its totient is φ = 11381620.

The previous prime is 11381597. The next prime is 11381633. The reversal of 11381621 is 12618311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6027025 + 5354596 = 2455^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 11381621 - 2¹⁸ = 11119477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11381221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5690810 + 5690811.

It is an arithmetic number, because the mean of its divisors is an integer number (5690811).

Almost surely, 2^11381621 is an apocalyptic number.

It is an amenable number.

11381621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11381621 is an equidigital number, since it uses as much as digits as its factorization.

11381621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 11381621 is about 3373.6658103612. The cubic root of 11381621 is about 224.9406987752.

Adding to 11381621 its reverse (12618311), we get a palindrome (23999932).

The spelling of 11381621 in words is "eleven million, three hundred eighty-one thousand, six hundred twenty-one".