7281281 has 4 divisors (see below), whose sum is σ = 8321472. Its totient is φ = 6241092.

The previous prime is 7281277. The next prime is 7281283. The reversal of 7281281 is 1821827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7281281 - 2² = 7281277 is a prime.

It is a super-2 number, since 2×7281281² = 106034106001922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7281283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520085 + ... + 520098.

It is an arithmetic number, because the mean of its divisors is an integer number (2080368).

Almost surely, 2^7281281 is an apocalyptic number.

It is an amenable number.

7281281 is a deficient number, since it is larger than the sum of its proper divisors (1040191).

7281281 is a wasteful number, since it uses less digits than its factorization.

7281281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040190.

The product of its digits is 1792, while the sum is 29.

The square root of 7281281 is about 2698.3848872983. The cubic root of 7281281 is about 193.8217887286.

The spelling of 7281281 in words is "seven million, two hundred eighty-one thousand, two hundred eighty-one".