252547021 has 2 divisors, whose sum is σ = 252547022. Its totient is φ = 252547020.

The previous prime is 252546997. The next prime is 252547063. The reversal of 252547021 is 120745252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160655625 + 91891396 = 12675^2 + 9586^2 .

It is a cyclic number.

It is not a de Polignac number, because 252547021 - 2¹³ = 252538829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252547091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126273510 + 126273511.

It is an arithmetic number, because the mean of its divisors is an integer number (126273511).

Almost surely, 2^252547021 is an apocalyptic number.

It is an amenable number.

252547021 is a deficient number, since it is larger than the sum of its proper divisors (1).

252547021 is an equidigital number, since it uses as much as digits as its factorization.

252547021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 252547021 is about 15891.7280684009. The cubic root of 252547021 is about 632.0926640353.

The spelling of 252547021 in words is "two hundred fifty-two million, five hundred forty-seven thousand, twenty-one".