621371 has 2 divisors, whose sum is σ = 621372. Its totient is φ = 621370.

The previous prime is 621359. The next prime is 621389. The reversal of 621371 is 173126.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621371 is a prime.

It is a super-2 number, since 2×621371² = 772203839282, which contains 22 as substring.

It is a Chen prime.

It is equal to p₅₀₇₁₇ and since 621371 and 50717 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (621301) 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 as a sum of consecutive naturals, namely, 310685 + 310686.

It is an arithmetic number, because the mean of its divisors is an integer number (310686).

2⁶²¹³⁷¹ is an apocalyptic number.

621371 is a deficient number, since it is larger than the sum of its proper divisors (1).

621371 is an equidigital number, since it uses as much as digits as its factorization.

621371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 20.

The square root of 621371 is about 788.2708925236. The cubic root of 621371 is about 85.3329959432.

Adding to 621371 its reverse (173126), we get a palindrome (794497).

The spelling of 621371 in words is "six hundred twenty-one thousand, three hundred seventy-one".