1226565421 has 2 divisors, whose sum is σ = 1226565422. Its totient is φ = 1226565420.

The previous prime is 1226565409. The next prime is 1226565433. The reversal of 1226565421 is 1245656221.

It is a balanced prime because it is at equal distance from previous prime (1226565409) and next prime (1226565433).

It can be written as a sum of positive squares in only one way, i.e., 1225980196 + 585225 = 35014^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226565421 - 2¹³ = 1226557229 is a prime.

It is a congruent number.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613282710 + 613282711.

It is an arithmetic number, because the mean of its divisors is an integer number (613282711).

Almost surely, 2^1226565421 is an apocalyptic number.

It is an amenable number.

1226565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226565421 is an equidigital number, since it uses as much as digits as its factorization.

1226565421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 1226565421 is about 35022.3560172642. The cubic root of 1226565421 is about 1070.4430636657.

The spelling of 1226565421 in words is "one billion, two hundred twenty-six million, five hundred sixty-five thousand, four hundred twenty-one".