7315681 has 4 divisors (see below), whose sum is σ = 7321600. Its totient is φ = 7309764.

The previous prime is 7315673. The next prime is 7315687. The reversal of 7315681 is 1865137.

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.

It is a cyclic number.

It is not a de Polignac number, because 7315681 - 2³ = 7315673 is a prime.

It is a super-2 number, since 2×7315681² = 107038376987522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7315687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321 + ... + 3838.

It is an arithmetic number, because the mean of its divisors is an integer number (1830400).

Almost surely, 2^7315681 is an apocalyptic number.

It is an amenable number.

7315681 is a deficient number, since it is larger than the sum of its proper divisors (5919).

7315681 is a wasteful number, since it uses less digits than its factorization.

7315681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5918.

The product of its digits is 5040, while the sum is 31.

The square root of 7315681 is about 2704.7515597555. The cubic root of 7315681 is about 194.1265426576.

It can be divided in two parts, 73156 and 81, that added together give a palindrome (73237).

The spelling of 7315681 in words is "seven million, three hundred fifteen thousand, six hundred eighty-one".