7118681 has 4 divisors (see below), whose sum is σ = 7184100. Its totient is φ = 7053264.

The previous prime is 7118677. The next prime is 7118687. The reversal of 7118681 is 1868117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1868117 = 59 ⋅31663.

It can be written as a sum of positive squares in 2 ways, for example, as 5480281 + 1638400 = 2341^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 7118681 - 2² = 7118677 is a prime.

It is a super-2 number, since 2×7118681² = 101351238359522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7118687) 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, 32546 + ... + 32763.

It is an arithmetic number, because the mean of its divisors is an integer number (1796025).

Almost surely, 2^7118681 is an apocalyptic number.

It is an amenable number.

7118681 is a deficient number, since it is larger than the sum of its proper divisors (65419).

7118681 is a wasteful number, since it uses less digits than its factorization.

7118681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65418.

The product of its digits is 2688, while the sum is 32.

The square root of 7118681 is about 2668.0856433031. The cubic root of 7118681 is about 192.3681539406.

The spelling of 7118681 in words is "seven million, one hundred eighteen thousand, six hundred eighty-one".