7521281 has 2 divisors, whose sum is σ = 7521282. Its totient is φ = 7521280.

The previous prime is 7521277. The next prime is 7521287. The reversal of 7521281 is 1821257.

7521281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 839056 = 2585^2 + 916^2 .

It is an emirp because it is prime and its reverse (1821257) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7521281 - 2² = 7521277 is a prime.

It is a super-2 number, since 2×7521281² = 113139335761922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7521281.

It is not a weakly prime, because it can be changed into another prime (7521287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3760640 + 3760641.

It is an arithmetic number, because the mean of its divisors is an integer number (3760641).

Almost surely, 2^7521281 is an apocalyptic number.

It is an amenable number.

7521281 is a deficient number, since it is larger than the sum of its proper divisors (1).

7521281 is an equidigital number, since it uses as much as digits as its factorization.

7521281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 26.

The square root of 7521281 is about 2742.4953965321. The cubic root of 7521281 is about 195.9283456665.

The spelling of 7521281 in words is "seven million, five hundred twenty-one thousand, two hundred eighty-one".