621619 has 2 divisors, whose sum is σ = 621620. Its totient is φ = 621618.

The previous prime is 621617. The next prime is 621629. The reversal of 621619 is 916126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621619 - 2¹ = 621617 is a prime.

It is a super-2 number, since 2×621619² = 772820362322, which contains 22 as substring.

Together with 621617, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 621593 and 621602.

It is not a weakly prime, because it can be changed into another prime (621611) 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 as a sum of consecutive naturals, namely, 310809 + 310810.

It is an arithmetic number, because the mean of its divisors is an integer number (310810).

2⁶²¹⁶¹⁹ is an apocalyptic number.

621619 is a deficient number, since it is larger than the sum of its proper divisors (1).

621619 is an equidigital number, since it uses as much as digits as its factorization.

621619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 621619 is about 788.4281831594. The cubic root of 621619 is about 85.3443470620.

It can be divided in two parts, 62 and 1619, that added together give a square (1681 = 41²).

The spelling of 621619 in words is "six hundred twenty-one thousand, six hundred nineteen".