52781249 has 2 divisors, whose sum is σ = 52781250. Its totient is φ = 52781248.

The previous prime is 52781171. The next prime is 52781303. The reversal of 52781249 is 94218725.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52780225 + 1024 = 7265^2 + 32^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52781249 is a prime.

It is not a weakly prime, because it can be changed into another prime (52781149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26390624 + 26390625.

It is an arithmetic number, because the mean of its divisors is an integer number (26390625).

Almost surely, 2^52781249 is an apocalyptic number.

It is an amenable number.

52781249 is a deficient number, since it is larger than the sum of its proper divisors (1).

52781249 is an equidigital number, since it uses as much as digits as its factorization.

52781249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 52781249 is about 7265.0704745377. The cubic root of 52781249 is about 375.1110758366. Note that the first 3 decimals are identical.

The spelling of 52781249 in words is "fifty-two million, seven hundred eighty-one thousand, two hundred forty-nine".