77852161 has 2 divisors, whose sum is σ = 77852162. Its totient is φ = 77852160.

The previous prime is 77852123. The next prime is 77852179. The reversal of 77852161 is 16125877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63297936 + 14554225 = 7956^2 + 3815^2 .

It is a cyclic number.

It is not a de Polignac number, because 77852161 - 2¹⁷ = 77721089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77852161.

It is not a weakly prime, because it can be changed into another prime (77852111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38926080 + 38926081.

It is an arithmetic number, because the mean of its divisors is an integer number (38926081).

Almost surely, 2^77852161 is an apocalyptic number.

It is an amenable number.

77852161 is a deficient number, since it is larger than the sum of its proper divisors (1).

77852161 is an equidigital number, since it uses as much as digits as its factorization.

77852161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 37.

The square root of 77852161 is about 8823.3871614024. The cubic root of 77852161 is about 426.9957548843.

The spelling of 77852161 in words is "seventy-seven million, eight hundred fifty-two thousand, one hundred sixty-one".