621255 has 16 divisors (see below), whose sum is σ = 1008000. Its totient is φ = 326688.

The previous prime is 621241. The next prime is 621259. The reversal of 621255 is 552126.

It is not a de Polignac number, because 621255 - 2⁴ = 621239 is a prime.

It is a d-powerful number, because it can be written as 6⁷ + 2¹⁰ + 2¹⁸ + 1 + 5² + 5⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 996 + ... + 1494.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2⁶²¹²⁵⁵ is an apocalyptic number.

621255 is a deficient number, since it is larger than the sum of its proper divisors (386745).

621255 is a wasteful number, since it uses less digits than its factorization.

621255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590.

The product of its digits is 600, while the sum is 21.

The square root of 621255 is about 788.1973103227. The cubic root of 621255 is about 85.3276855122.

The spelling of 621255 in words is "six hundred twenty-one thousand, two hundred fifty-five".