11637221 has 2 divisors, whose sum is σ = 11637222. Its totient is φ = 11637220.

The previous prime is 11637211. The next prime is 11637233. The reversal of 11637221 is 12273611.

11637221 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., 11464996 + 172225 = 3386^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 11637221 - 2¹⁰ = 11636197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11637211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5818610 + 5818611.

It is an arithmetic number, because the mean of its divisors is an integer number (5818611).

Almost surely, 2^11637221 is an apocalyptic number.

It is an amenable number.

11637221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11637221 is an equidigital number, since it uses as much as digits as its factorization.

11637221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 11637221 is about 3411.3371278723. The cubic root of 11637221 is about 226.6120992733.

The spelling of 11637221 in words is "eleven million, six hundred thirty-seven thousand, two hundred twenty-one".