421343609 has 2 divisors, whose sum is σ = 421343610. Its totient is φ = 421343608.

The previous prime is 421343561. The next prime is 421343651. The reversal of 421343609 is 906343124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415018384 + 6325225 = 20372^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 421343609 - 2¹⁶ = 421278073 is a prime.

It is not a weakly prime, because it can be changed into another prime (421333609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210671804 + 210671805.

It is an arithmetic number, because the mean of its divisors is an integer number (210671805).

Almost surely, 2^421343609 is an apocalyptic number.

It is an amenable number.

421343609 is a deficient number, since it is larger than the sum of its proper divisors (1).

421343609 is an equidigital number, since it uses as much as digits as its factorization.

421343609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 421343609 is about 20526.6560598652. The cubic root of 421343609 is about 749.6849693224.

The spelling of 421343609 in words is "four hundred twenty-one million, three hundred forty-three thousand, six hundred nine".