506565421 has 2 divisors, whose sum is σ = 506565422. Its totient is φ = 506565420.

The previous prime is 506565419. The next prime is 506565431. The reversal of 506565421 is 124565605.

506565421 is nontrivially palindromic in base 4.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484616196 + 21949225 = 22014^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 506565421 - 2¹ = 506565419 is a prime.

It is a super-3 number, since 3×506565421³ (a number of 27 digits) contains 333 as substring.

Together with 506565419, 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 (506565431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253282710 + 253282711.

It is an arithmetic number, because the mean of its divisors is an integer number (253282711).

Almost surely, 2^506565421 is an apocalyptic number.

It is an amenable number.

506565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

506565421 is an equidigital number, since it uses as much as digits as its factorization.

506565421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 506565421 is about 22507.0082640941. The cubic root of 506565421 is about 797.1594158943.

The spelling of 506565421 in words is "five hundred six million, five hundred sixty-five thousand, four hundred twenty-one".