421486909 has 2 divisors, whose sum is σ = 421486910. Its totient is φ = 421486908.

The previous prime is 421486907. The next prime is 421486927. The reversal of 421486909 is 909684124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361114009 + 60372900 = 19003^2 + 7770^2 .

It is a cyclic number.

It is not a de Polignac number, because 421486909 - 2¹ = 421486907 is a prime.

Together with 421486907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421486907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210743454 + 210743455.

It is an arithmetic number, because the mean of its divisors is an integer number (210743455).

Almost surely, 2^421486909 is an apocalyptic number.

It is an amenable number.

421486909 is a deficient number, since it is larger than the sum of its proper divisors (1).

421486909 is an equidigital number, since it uses as much as digits as its factorization.

421486909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 421486909 is about 20530.1463462879. The cubic root of 421486909 is about 749.7699495911.

The spelling of 421486909 in words is "four hundred twenty-one million, four hundred eighty-six thousand, nine hundred nine".