7977161 has 2 divisors, whose sum is σ = 7977162. Its totient is φ = 7977160.

The previous prime is 7977157. The next prime is 7977187. The reversal of 7977161 is 1617797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5593225 + 2383936 = 2365^2 + 1544^2 .

It is a cyclic number.

It is not a de Polignac number, because 7977161 - 2² = 7977157 is a prime.

It is not a weakly prime, because it can be changed into another prime (7977191) 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 as a sum of consecutive naturals, namely, 3988580 + 3988581.

It is an arithmetic number, because the mean of its divisors is an integer number (3988581).

Almost surely, 2^7977161 is an apocalyptic number.

It is an amenable number.

7977161 is a deficient number, since it is larger than the sum of its proper divisors (1).

7977161 is an equidigital number, since it uses as much as digits as its factorization.

7977161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18522, while the sum is 38.

The square root of 7977161 is about 2824.3868361115. The cubic root of 7977161 is about 199.8094935942.

The spelling of 7977161 in words is "seven million, nine hundred seventy-seven thousand, one hundred sixty-one".