6421613 has 4 divisors (see below), whose sum is σ = 7005408. Its totient is φ = 5837820.

The previous prime is 6421589. The next prime is 6421637. The reversal of 6421613 is 3161246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6421589) and next prime (6421637).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421613 is a prime.

It is a super-2 number, since 2×6421613² = 82474227043538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291881 + ... + 291902.

It is an arithmetic number, because the mean of its divisors is an integer number (1751352).

Almost surely, 2^6421613 is an apocalyptic number.

It is an amenable number.

6421613 is a deficient number, since it is larger than the sum of its proper divisors (583795).

6421613 is a wasteful number, since it uses less digits than its factorization.

6421613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583794.

The product of its digits is 864, while the sum is 23.

The square root of 6421613 is about 2534.0901720341. The cubic root of 6421613 is about 185.8723157287.

Adding to 6421613 its reverse (3161246), we get a palindrome (9582859).

The spelling of 6421613 in words is "six million, four hundred twenty-one thousand, six hundred thirteen".