11171621 has 2 divisors, whose sum is σ = 11171622. Its totient is φ = 11171620.

The previous prime is 11171617. The next prime is 11171623. The reversal of 11171621 is 12617111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 835396 = 3215^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 11171621 - 2² = 11171617 is a prime.

Together with 11171623, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11171593 and 11171602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11171623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5585810 + 5585811.

It is an arithmetic number, because the mean of its divisors is an integer number (5585811).

Almost surely, 2^11171621 is an apocalyptic number.

It is an amenable number.

11171621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11171621 is an equidigital number, since it uses as much as digits as its factorization.

11171621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84, while the sum is 20.

The square root of 11171621 is about 3342.3974928186. The cubic root of 11171621 is about 223.5486567171.

Adding to 11171621 its reverse (12617111), we get a palindrome (23788732).

The spelling of 11171621 in words is "eleven million, one hundred seventy-one thousand, six hundred twenty-one".