252787221 has 6 divisors (see below), whose sum is σ = 365137110. Its totient is φ = 168524808.

The previous prime is 252787189. The next prime is 252787243. The reversal of 252787221 is 122787252.

It can be written as a sum of positive squares in only one way, i.e., 228432996 + 24354225 = 15114^2 + 4935^2 .

It is not a de Polignac number, because 252787221 - 2⁵ = 252787189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252787121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14043726 + ... + 14043743.

It is an arithmetic number, because the mean of its divisors is an integer number (60856185).

Almost surely, 2^252787221 is an apocalyptic number.

It is an amenable number.

252787221 is a deficient number, since it is larger than the sum of its proper divisors (112349889).

252787221 is a wasteful number, since it uses less digits than its factorization.

252787221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28087475 (or 28087472 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 252787221 is about 15899.2836631089. The cubic root of 252787221 is about 632.2929970895.

The spelling of 252787221 in words is "two hundred fifty-two million, seven hundred eighty-seven thousand, two hundred twenty-one".