7166981 has 4 divisors (see below), whose sum is σ = 7207200. Its totient is φ = 7126764.

The previous prime is 7166977. The next prime is 7166987. The reversal of 7166981 is 1896617.

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.

It is a cyclic number.

It is not a de Polignac number, because 7166981 - 2² = 7166977 is a prime.

It is a super-2 number, since 2×7166981² = 102731233308722, 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 (7166987) 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, 19841 + ... + 20198.

It is an arithmetic number, because the mean of its divisors is an integer number (1801800).

Almost surely, 2^7166981 is an apocalyptic number.

It is an amenable number.

7166981 is a deficient number, since it is larger than the sum of its proper divisors (40219).

7166981 is a wasteful number, since it uses less digits than its factorization.

7166981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40218.

The product of its digits is 18144, while the sum is 38.

The square root of 7166981 is about 2677.1217753401. The cubic root of 7166981 is about 192.8022440382.

The spelling of 7166981 in words is "seven million, one hundred sixty-six thousand, nine hundred eighty-one".