771111161 has 2 divisors, whose sum is σ = 771111162. Its totient is φ = 771111160.

The previous prime is 771111137. The next prime is 771111193. The reversal of 771111161 is 161111177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690901225 + 80209936 = 26285^2 + 8956^2 .

It is a cyclic number.

It is not a de Polignac number, because 771111161 - 2²⁶ = 704002297 is a prime.

It is a super-2 number, since 2×771111161² = 1189224845237535842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 771111161.

It is not a weakly prime, because it can be changed into another prime (771114161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385555580 + 385555581.

It is an arithmetic number, because the mean of its divisors is an integer number (385555581).

Almost surely, 2^771111161 is an apocalyptic number.

It is an amenable number.

771111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

771111161 is an equidigital number, since it uses as much as digits as its factorization.

771111161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294, while the sum is 26.

The square root of 771111161 is about 27768.8883644989. Note that the first 3 decimals coincide. The cubic root of 771111161 is about 917.0063218372.

The spelling of 771111161 in words is "seven hundred seventy-one million, one hundred eleven thousand, one hundred sixty-one".