7487281 has 2 divisors, whose sum is σ = 7487282. Its totient is φ = 7487280.

The previous prime is 7487269. The next prime is 7487287. The reversal of 7487281 is 1827847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7480225 + 7056 = 2735^2 + 84^2 .

It is a cyclic number.

It is not a de Polignac number, because 7487281 - 2¹³ = 7479089 is a prime.

It is a super-2 number, since 2×7487281² = 112118753545922, which contains 22 as substring.

7487281 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7487281.

It is not a weakly prime, because it can be changed into another prime (7487287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3743640 + 3743641.

It is an arithmetic number, because the mean of its divisors is an integer number (3743641).

Almost surely, 2^7487281 is an apocalyptic number.

It is an amenable number.

7487281 is a deficient number, since it is larger than the sum of its proper divisors (1).

7487281 is an equidigital number, since it uses as much as digits as its factorization.

7487281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 37.

The square root of 7487281 is about 2736.2896411016. The cubic root of 7487281 is about 195.6326678904.

The spelling of 7487281 in words is "seven million, four hundred eighty-seven thousand, two hundred eighty-one".