11165621 has 2 divisors, whose sum is σ = 11165622. Its totient is φ = 11165620.

The previous prime is 11165591. The next prime is 11165639. The reversal of 11165621 is 12656111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10817521 + 348100 = 3289^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 11165621 - 2²² = 6971317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11165221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5582810 + 5582811.

It is an arithmetic number, because the mean of its divisors is an integer number (5582811).

Almost surely, 2^11165621 is an apocalyptic number.

It is an amenable number.

11165621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11165621 is an equidigital number, since it uses as much as digits as its factorization.

11165621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 11165621 is about 3341.4998129582. The cubic root of 11165621 is about 223.5086287410.

The spelling of 11165621 in words is "eleven million, one hundred sixty-five thousand, six hundred twenty-one".