421347161 has 2 divisors, whose sum is σ = 421347162. Its totient is φ = 421347160.

The previous prime is 421347139. The next prime is 421347197. The reversal of 421347161 is 161743124.

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., 409657600 + 11689561 = 20240^2 + 3419^2 .

It is a cyclic number.

It is not a de Polignac number, because 421347161 - 2¹⁰ = 421346137 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (421347361) 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, 210673580 + 210673581.

It is an arithmetic number, because the mean of its divisors is an integer number (210673581).

Almost surely, 2^421347161 is an apocalyptic number.

It is an amenable number.

421347161 is a deficient number, since it is larger than the sum of its proper divisors (1).

421347161 is an equidigital number, since it uses as much as digits as its factorization.

421347161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 421347161 is about 20526.7425813255. The cubic root of 421347161 is about 749.6870759747.

The spelling of 421347161 in words is "four hundred twenty-one million, three hundred forty-seven thousand, one hundred sixty-one".