2528721281 has 2 divisors, whose sum is σ = 2528721282. Its totient is φ = 2528721280.

The previous prime is 2528721277. The next prime is 2528721301. The reversal of 2528721281 is 1821278252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2129361025 + 399360256 = 46145^2 + 19984^2 .

It is a cyclic number.

It is not a de Polignac number, because 2528721281 - 2² = 2528721277 is a prime.

It is a super-2 number, since 2×2528721281² = 12788862633964561922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2528720281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1264360640 + 1264360641.

It is an arithmetic number, because the mean of its divisors is an integer number (1264360641).

Almost surely, 2^2528721281 is an apocalyptic number.

It is an amenable number.

2528721281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2528721281 is an equidigital number, since it uses as much as digits as its factorization.

2528721281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 38.

The square root of 2528721281 is about 50286.3926027708. The cubic root of 2528721281 is about 1362.3864675032.

The spelling of 2528721281 in words is "two billion, five hundred twenty-eight million, seven hundred twenty-one thousand, two hundred eighty-one".