625221 has 12 divisors (see below), whose sum is σ = 911872. Its totient is φ = 412776.

The previous prime is 625213. The next prime is 625231. The reversal of 625221 is 122526.

It is not a de Polignac number, because 625221 - 2³ = 625213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 625194 and 625203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 870 + ... + 1416.

2⁶²⁵²²¹ is an apocalyptic number.

It is an amenable number.

625221 is a deficient number, since it is larger than the sum of its proper divisors (286651).

625221 is a wasteful number, since it uses less digits than its factorization.

625221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 677 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 625221 is about 790.7091753610. The cubic root of 625221 is about 85.5088736045.

Adding to 625221 its reverse (122526), we get a palindrome (747747).

The spelling of 625221 in words is "six hundred twenty-five thousand, two hundred twenty-one".