621219 has 4 divisors (see below), whose sum is σ = 828296. Its totient is φ = 414144.

The previous prime is 621217. The next prime is 621223. The reversal of 621219 is 912126.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 621219 - 2¹ = 621217 is a prime.

It is a super-2 number, since 2×621219² = 771826091922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 621195 and 621204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103534 + ... + 103539.

It is an arithmetic number, because the mean of its divisors is an integer number (207074).

2⁶²¹²¹⁹ is an apocalyptic number.

621219 is a deficient number, since it is larger than the sum of its proper divisors (207077).

621219 is a wasteful number, since it uses less digits than its factorization.

621219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207076.

The product of its digits is 216, while the sum is 21.

The square root of 621219 is about 788.1744730705. The cubic root of 621219 is about 85.3260373129.

The spelling of 621219 in words is "six hundred twenty-one thousand, two hundred nineteen".