7671981 has 8 divisors (see below), whose sum is σ = 10831104. Its totient is φ = 4813760.

The previous prime is 7671977. The next prime is 7672003. The reversal of 7671981 is 1891767.

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 7671981 - 2² = 7671977 is a prime.

It is a super-2 number, since 2×7671981² = 117718584928722, which contains 22 as substring.

7671981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7671901) 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 7 ways as a sum of consecutive naturals, for example, 75165 + ... + 75266.

It is an arithmetic number, because the mean of its divisors is an integer number (1353888).

Almost surely, 2^7671981 is an apocalyptic number.

It is an amenable number.

7671981 is a deficient number, since it is larger than the sum of its proper divisors (3159123).

7671981 is a wasteful number, since it uses less digits than its factorization.

7671981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150451.

The product of its digits is 21168, while the sum is 39.

The square root of 7671981 is about 2769.8341105561. The cubic root of 7671981 is about 197.2282734402.

The spelling of 7671981 in words is "seven million, six hundred seventy-one thousand, nine hundred eighty-one".