7856161 has 2 divisors, whose sum is σ = 7856162. Its totient is φ = 7856160.

The previous prime is 7856089. The next prime is 7856197. The reversal of 7856161 is 1616587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4227136 + 3629025 = 2056^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 7856161 - 2²¹ = 5759009 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (7859161) 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 as a sum of consecutive naturals, namely, 3928080 + 3928081.

It is an arithmetic number, because the mean of its divisors is an integer number (3928081).

Almost surely, 2^7856161 is an apocalyptic number.

It is an amenable number.

7856161 is a deficient number, since it is larger than the sum of its proper divisors (1).

7856161 is an equidigital number, since it uses as much as digits as its factorization.

7856161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 7856161 is about 2802.8844071777. The cubic root of 7856161 is about 198.7940851273.

The spelling of 7856161 in words is "seven million, eight hundred fifty-six thousand, one hundred sixty-one".