421134509 has 2 divisors, whose sum is σ = 421134510. Its totient is φ = 421134508.

The previous prime is 421134499. The next prime is 421134517. The reversal of 421134509 is 905431124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311346025 + 109788484 = 17645^2 + 10478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421134509 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 (421134599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210567254 + 210567255.

It is an arithmetic number, because the mean of its divisors is an integer number (210567255).

Almost surely, 2^421134509 is an apocalyptic number.

It is an amenable number.

421134509 is a deficient number, since it is larger than the sum of its proper divisors (1).

421134509 is an equidigital number, since it uses as much as digits as its factorization.

421134509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 421134509 is about 20521.5620506822. The cubic root of 421134509 is about 749.5609335295.

The spelling of 421134509 in words is "four hundred twenty-one million, one hundred thirty-four thousand, five hundred nine".