11613221 has 2 divisors, whose sum is σ = 11613222. Its totient is φ = 11613220.

The previous prime is 11613197. The next prime is 11613233. The reversal of 11613221 is 12231611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11464996 + 148225 = 3386^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 11613221 - 2⁶ = 11613157 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11613221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11613271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5806610 + 5806611.

It is an arithmetic number, because the mean of its divisors is an integer number (5806611).

Almost surely, 2^11613221 is an apocalyptic number.

It is an amenable number.

11613221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11613221 is an equidigital number, since it uses as much as digits as its factorization.

11613221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 11613221 is about 3407.8176300970. The cubic root of 11613221 is about 226.4562077164.

Adding to 11613221 its reverse (12231611), we get a palindrome (23844832).

The spelling of 11613221 in words is "eleven million, six hundred thirteen thousand, two hundred twenty-one".