421151209 has 2 divisors, whose sum is σ = 421151210. Its totient is φ = 421151208.

The previous prime is 421151201. The next prime is 421151233. The reversal of 421151209 is 902151124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359481600 + 61669609 = 18960^2 + 7853^2 .

It is a cyclic number.

It is not a de Polignac number, because 421151209 - 2³ = 421151201 is a prime.

It is not a weakly prime, because it can be changed into another prime (421151201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210575604 + 210575605.

It is an arithmetic number, because the mean of its divisors is an integer number (210575605).

Almost surely, 2^421151209 is an apocalyptic number.

It is an amenable number.

421151209 is a deficient number, since it is larger than the sum of its proper divisors (1).

421151209 is an equidigital number, since it uses as much as digits as its factorization.

421151209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 421151209 is about 20521.9689357527. The cubic root of 421151209 is about 749.5708412921.

The spelling of 421151209 in words is "four hundred twenty-one million, one hundred fifty-one thousand, two hundred nine".