421613 has 6 divisors (see below), whose sum is σ = 441294. Its totient is φ = 402776.

The previous prime is 421609. The next prime is 421621. The reversal of 421613 is 316124.

It can be written as a sum of positive squares in only one way, i.e., 357604 + 64009 = 598^2 + 253^2 .

It is not a de Polignac number, because 421613 - 2² = 421609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421591 and 421600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421633) 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 in 5 ways as a sum of consecutive naturals, for example, 131 + ... + 927.

It is an arithmetic number, because the mean of its divisors is an integer number (73549).

2⁴²¹⁶¹³ is an apocalyptic number.

It is an amenable number.

421613 is a deficient number, since it is larger than the sum of its proper divisors (19681).

421613 is an equidigital number, since it uses as much as digits as its factorization.

421613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 820 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 421613 is about 649.3173338207. The cubic root of 421613 is about 74.9844708589.

Adding to 421613 its reverse (316124), we get a palindrome (737737).

The spelling of 421613 in words is "four hundred twenty-one thousand, six hundred thirteen".