7215681 has 8 divisors (see below), whose sum is σ = 10495584. Its totient is φ = 4373120.

The previous prime is 7215679. The next prime is 7215697. The reversal of 7215681 is 1865127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7215681 - 2¹ = 7215679 is a prime.

It is a super-2 number, since 2×7215681² = 104132104587522, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7215601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109296 + ... + 109361.

It is an arithmetic number, because the mean of its divisors is an integer number (1311948).

Almost surely, 2^7215681 is an apocalyptic number.

It is an amenable number.

7215681 is a deficient number, since it is larger than the sum of its proper divisors (3279903).

7215681 is a wasteful number, since it uses less digits than its factorization.

7215681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218671.

The product of its digits is 3360, while the sum is 30.

The square root of 7215681 is about 2686.2019656012. The cubic root of 7215681 is about 193.2379589694.

It can be divided in two parts, 72 and 15681, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 7215681 in words is "seven million, two hundred fifteen thousand, six hundred eighty-one".