52781369 has 2 divisors, whose sum is σ = 52781370. Its totient is φ = 52781368.

The previous prime is 52781357. The next prime is 52781387. The reversal of 52781369 is 96318725.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38440000 + 14341369 = 6200^2 + 3787^2 .

It is a cyclic number.

It is not a de Polignac number, because 52781369 - 2⁴ = 52781353 is a prime.

It is a super-2 number, since 2×52781369² = 5571745827028322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (52781669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26390684 + 26390685.

It is an arithmetic number, because the mean of its divisors is an integer number (26390685).

Almost surely, 2^52781369 is an apocalyptic number.

It is an amenable number.

52781369 is a deficient number, since it is larger than the sum of its proper divisors (1).

52781369 is an equidigital number, since it uses as much as digits as its factorization.

52781369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 52781369 is about 7265.0787332279. The cubic root of 52781369 is about 375.1113601124. Note that the first 3 decimals are identical.

The spelling of 52781369 in words is "fifty-two million, seven hundred eighty-one thousand, three hundred sixty-nine".