1245421109 has 2 divisors, whose sum is σ = 1245421110. Its totient is φ = 1245421108.

The previous prime is 1245421081. The next prime is 1245421117. The reversal of 1245421109 is 9011245421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1031822884 + 213598225 = 32122^2 + 14615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245421109 - 2⁸ = 1245420853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245421909) by changing a digit.

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, 622710554 + 622710555.

It is an arithmetic number, because the mean of its divisors is an integer number (622710555).

Almost surely, 2^1245421109 is an apocalyptic number.

It is an amenable number.

1245421109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245421109 is an equidigital number, since it uses as much as digits as its factorization.

1245421109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1245421109 is about 35290.5243514460. The cubic root of 1245421109 is about 1075.9004127992.

The spelling of 1245421109 in words is "one billion, two hundred forty-five million, four hundred twenty-one thousand, one hundred nine".