7181281 has 4 divisors (see below), whose sum is σ = 7186864. Its totient is φ = 7175700.

The previous prime is 7181257. The next prime is 7181309. The reversal of 7181281 is 1821817.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1821817 = 131 ⋅13907.

It is a cyclic number.

It is not a de Polignac number, because 7181281 - 2⁵ = 7181249 is a prime.

It is a super-2 number, since 2×7181281² = 103141593601922, which contains 22 as substring.

It is a Duffinian number.

7181281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7181231) 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 in 3 ways as a sum of consecutive naturals, for example, 226 + ... + 3796.

It is an arithmetic number, because the mean of its divisors is an integer number (1796716).

Almost surely, 2^7181281 is an apocalyptic number.

It is an amenable number.

7181281 is a deficient number, since it is larger than the sum of its proper divisors (5583).

7181281 is a wasteful number, since it uses less digits than its factorization.

7181281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582.

The product of its digits is 896, while the sum is 28.

The square root of 7181281 is about 2679.7912232112. The cubic root of 7181281 is about 192.9303891352.

The spelling of 7181281 in words is "seven million, one hundred eighty-one thousand, two hundred eighty-one".