7727161 has 4 divisors (see below), whose sum is σ = 8321572. Its totient is φ = 7132752.

The previous prime is 7727131. The next prime is 7727189. The reversal of 7727161 is 1617277.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 571536 + 7155625 = 756^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 7727161 - 2⁷ = 7727033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7727101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297186 + ... + 297211.

It is an arithmetic number, because the mean of its divisors is an integer number (2080393).

Almost surely, 2^7727161 is an apocalyptic number.

It is an amenable number.

7727161 is a deficient number, since it is larger than the sum of its proper divisors (594411).

7727161 is a wasteful number, since it uses less digits than its factorization.

7727161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594410.

The product of its digits is 4116, while the sum is 31.

The square root of 7727161 is about 2779.7771493413. Note that the first 3 decimals coincide. The cubic root of 7727161 is about 197.6999928959.

The spelling of 7727161 in words is "seven million, seven hundred twenty-seven thousand, one hundred sixty-one".