416565421 has 2 divisors, whose sum is σ = 416565422. Its totient is φ = 416565420.

The previous prime is 416565419. The next prime is 416565439. The reversal of 416565421 is 124565614.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303142921 + 113422500 = 17411^2 + 10650^2 .

It is a cyclic number.

It is not a de Polignac number, because 416565421 - 2¹ = 416565419 is a prime.

Together with 416565419, 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 (416565451) 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, 208282710 + 208282711.

It is an arithmetic number, because the mean of its divisors is an integer number (208282711).

Almost surely, 2^416565421 is an apocalyptic number.

It is an amenable number.

416565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

416565421 is an equidigital number, since it uses as much as digits as its factorization.

416565421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 416565421 is about 20409.9343703011. The cubic root of 416565421 is about 746.8402898174.

The spelling of 416565421 in words is "four hundred sixteen million, five hundred sixty-five thousand, four hundred twenty-one".