7118981 has 4 divisors (see below), whose sum is σ = 7124364. Its totient is φ = 7113600.

The previous prime is 7118963. The next prime is 7118987. The reversal of 7118981 is 1898117.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1898117 = 13 ⋅146009.

It can be written as a sum of positive squares in 2 ways, for example, as 6100900 + 1018081 = 2470^2 + 1009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7118981 is a prime.

It is a super-2 number, since 2×7118981² = 101359780956722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7118987) 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, 821 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (1781091).

Almost surely, 2^7118981 is an apocalyptic number.

It is an amenable number.

7118981 is a deficient number, since it is larger than the sum of its proper divisors (5383).

7118981 is a wasteful number, since it uses less digits than its factorization.

7118981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382.

The product of its digits is 4032, while the sum is 35.

The square root of 7118981 is about 2668.1418627952. The cubic root of 7118981 is about 192.3708562032.

The spelling of 7118981 in words is "seven million, one hundred eighteen thousand, nine hundred eighty-one".