252164821 has 2 divisors, whose sum is σ = 252164822. Its totient is φ = 252164820.

The previous prime is 252164813. The next prime is 252164833. The reversal of 252164821 is 128461252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211702500 + 40462321 = 14550^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 252164821 - 2³ = 252164813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252164921) 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, 126082410 + 126082411.

It is an arithmetic number, because the mean of its divisors is an integer number (126082411).

Almost surely, 2^252164821 is an apocalyptic number.

It is an amenable number.

252164821 is a deficient number, since it is larger than the sum of its proper divisors (1).

252164821 is an equidigital number, since it uses as much as digits as its factorization.

252164821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 252164821 is about 15879.6983913423. The cubic root of 252164821 is about 631.7736372546.

The spelling of 252164821 in words is "two hundred fifty-two million, one hundred sixty-four thousand, eight hundred twenty-one".