621289 has 2 divisors, whose sum is σ = 621290. Its totient is φ = 621288.

The previous prime is 621259. The next prime is 621301. The reversal of 621289 is 982126.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444889 + 176400 = 667^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 621289 - 2⁹ = 620777 is a prime.

621289 is a lucky number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (621239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310644 + 310645.

It is an arithmetic number, because the mean of its divisors is an integer number (310645).

2⁶²¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

621289 is a deficient number, since it is larger than the sum of its proper divisors (1).

621289 is an equidigital number, since it uses as much as digits as its factorization.

621289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 621289 is about 788.2188782312. The cubic root of 621289 is about 85.3292420863.

The spelling of 621289 in words is "six hundred twenty-one thousand, two hundred eighty-nine".