7215281 has 4 divisors (see below), whose sum is σ = 7448064. Its totient is φ = 6982500.

The previous prime is 7215277. The next prime is 7215283. The reversal of 7215281 is 1825127.

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 an emirpimes, since its reverse is a distinct semiprime: 1825127 = 757 ⋅2411.

It is a cyclic number.

It is not a de Polignac number, because 7215281 - 2² = 7215277 is a prime.

It is a super-2 number, since 2×7215281² = 104120559817922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7215281.

It is not an unprimeable number, because it can be changed into a prime (7215283) 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, 116345 + ... + 116406.

It is an arithmetic number, because the mean of its divisors is an integer number (1862016).

Almost surely, 2^7215281 is an apocalyptic number.

It is an amenable number.

7215281 is a deficient number, since it is larger than the sum of its proper divisors (232783).

7215281 is a wasteful number, since it uses less digits than its factorization.

7215281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232782.

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

The square root of 7215281 is about 2686.1275100039. The cubic root of 7215281 is about 193.2343881994.

The spelling of 7215281 in words is "seven million, two hundred fifteen thousand, two hundred eighty-one".