252621 has 6 divisors (see below), whose sum is σ = 364910. Its totient is φ = 168408.

The previous prime is 252617. The next prime is 252641. The reversal of 252621 is 126252.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 81225 = 414^2 + 285^2 .

It is not a de Polignac number, because 252621 - 2² = 252617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 252594 and 252603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14026 + ... + 14043.

2²⁵²⁶²¹ is an apocalyptic number.

It is an amenable number.

252621 is a deficient number, since it is larger than the sum of its proper divisors (112289).

252621 is a wasteful number, since it uses less digits than its factorization.

252621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28075 (or 28072 counting only the distinct ones).

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

The square root of 252621 is about 502.6141661354. The cubic root of 252621 is about 63.2154377979.

Adding to 252621 its reverse (126252), we get a palindrome (378873).

The spelling of 252621 in words is "two hundred fifty-two thousand, six hundred twenty-one".