52212781 has 2 divisors, whose sum is σ = 52212782. Its totient is φ = 52212780.

The previous prime is 52212751. The next prime is 52212799. The reversal of 52212781 is 18721225.

52212781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33246756 + 18966025 = 5766^2 + 4355^2 .

It is a cyclic number.

It is not a de Polignac number, because 52212781 - 2⁵ = 52212749 is a prime.

It is a super-2 number, since 2×52212781² = 5452348999507922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52212701) 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 as a sum of consecutive naturals, namely, 26106390 + 26106391.

It is an arithmetic number, because the mean of its divisors is an integer number (26106391).

Almost surely, 2^52212781 is an apocalyptic number.

It is an amenable number.

52212781 is a deficient number, since it is larger than the sum of its proper divisors (1).

52212781 is an equidigital number, since it uses as much as digits as its factorization.

52212781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 52212781 is about 7225.8411967051. The cubic root of 52212781 is about 373.7595301873.

The spelling of 52212781 in words is "fifty-two million, two hundred twelve thousand, seven hundred eighty-one".