1226643251 has 2 divisors, whose sum is σ = 1226643252. Its totient is φ = 1226643250.

The previous prime is 1226643221. The next prime is 1226643269. The reversal of 1226643251 is 1523466221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1226643251 - 2¹⁰ = 1226642227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1226643221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613321625 + 613321626.

It is an arithmetic number, because the mean of its divisors is an integer number (613321626).

Almost surely, 2^1226643251 is an apocalyptic number.

1226643251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226643251 is an equidigital number, since it uses as much as digits as its factorization.

1226643251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The square root of 1226643251 is about 35023.4671470430. The cubic root of 1226643251 is about 1070.4657043446.

The spelling of 1226643251 in words is "one billion, two hundred twenty-six million, six hundred forty-three thousand, two hundred fifty-one".