1226258221 has 2 divisors, whose sum is σ = 1226258222. Its totient is φ = 1226258220.

The previous prime is 1226258207. The next prime is 1226258239. The reversal of 1226258221 is 1228526221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1149888100 + 76370121 = 33910^2 + 8739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1226258221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226258251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613129110 + 613129111.

It is an arithmetic number, because the mean of its divisors is an integer number (613129111).

Almost surely, 2^1226258221 is an apocalyptic number.

It is an amenable number.

1226258221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226258221 is an equidigital number, since it uses as much as digits as its factorization.

1226258221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 31.

The square root of 1226258221 is about 35017.9699725727. The cubic root of 1226258221 is about 1070.3536901026.

The spelling of 1226258221 in words is "one billion, two hundred twenty-six million, two hundred fifty-eight thousand, two hundred twenty-one".