52021261 has 2 divisors, whose sum is σ = 52021262. Its totient is φ = 52021260.

The previous prime is 52021247. The next prime is 52021313. The reversal of 52021261 is 16212025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46498761 + 5522500 = 6819^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 52021261 - 2⁷ = 52021133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26010630 + 26010631.

It is an arithmetic number, because the mean of its divisors is an integer number (26010631).

Almost surely, 2^52021261 is an apocalyptic number.

It is an amenable number.

52021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

52021261 is an equidigital number, since it uses as much as digits as its factorization.

52021261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 52021261 is about 7212.5765853820. The cubic root of 52021261 is about 373.3019785707.

Adding to 52021261 its reverse (16212025), we get a palindrome (68233286).

The spelling of 52021261 in words is "fifty-two million, twenty-one thousand, two hundred sixty-one".