252506221 has 4 divisors (see below), whose sum is σ = 275461344. Its totient is φ = 229551100.

The previous prime is 252506203. The next prime is 252506227. The reversal of 252506221 is 122605252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252506221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252506227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11477545 + ... + 11477566.

It is an arithmetic number, because the mean of its divisors is an integer number (68865336).

Almost surely, 2^252506221 is an apocalyptic number.

It is an amenable number.

252506221 is a deficient number, since it is larger than the sum of its proper divisors (22955123).

252506221 is a wasteful number, since it uses less digits than its factorization.

252506221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22955122.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 252506221 is about 15890.4443298480. Note that the first 3 decimals coincide. The cubic root of 252506221 is about 632.0586231539.

The spelling of 252506221 in words is "two hundred fifty-two million, five hundred six thousand, two hundred twenty-one".