286506221 has 2 divisors, whose sum is σ = 286506222. Its totient is φ = 286506220.

The previous prime is 286506217. The next prime is 286506293. The reversal of 286506221 is 122605682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233784100 + 52722121 = 15290^2 + 7261^2 .

It is a cyclic number.

It is not a de Polignac number, because 286506221 - 2² = 286506217 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 (286506211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143253110 + 143253111.

It is an arithmetic number, because the mean of its divisors is an integer number (143253111).

Almost surely, 2^286506221 is an apocalyptic number.

It is an amenable number.

286506221 is a deficient number, since it is larger than the sum of its proper divisors (1).

286506221 is an equidigital number, since it uses as much as digits as its factorization.

286506221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 286506221 is about 16926.4946459685. The cubic root of 286506221 is about 659.2417225024.

The spelling of 286506221 in words is "two hundred eighty-six million, five hundred six thousand, two hundred twenty-one".