7181661 has 8 divisors (see below), whose sum is σ = 9588384. Its totient is φ = 4781360.

The previous prime is 7181641. The next prime is 7181687. The reversal of 7181661 is 1661817.

It is a happy number.

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 7181661 - 2⁶ = 7181597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7181611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2530 + ... + 4556.

It is an arithmetic number, because the mean of its divisors is an integer number (1198548).

Almost surely, 2^7181661 is an apocalyptic number.

It is an amenable number.

7181661 is a deficient number, since it is larger than the sum of its proper divisors (2406723).

7181661 is a wasteful number, since it uses less digits than its factorization.

7181661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211.

The product of its digits is 2016, while the sum is 30.

The square root of 7181661 is about 2679.8621233190. The cubic root of 7181661 is about 192.9337920682.

The spelling of 7181661 in words is "seven million, one hundred eighty-one thousand, six hundred sixty-one".