776161 has 3 divisors (see below), whose sum is σ = 777043. Its totient is φ = 775280.

The previous prime is 776159. The next prime is 776173. The reversal of 776161 is 161677.

The square root of 776161 is 881.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 161677 = 107 ⋅1511.

It can be written as a sum of positive squares in only one way, i.e., 136161 + 640000 = 369^2 + 800^2 .

It is not a de Polignac number, because 776161 - 2¹ = 776159 is a prime.

It is a Duffinian number.

776161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (776561) 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 2 ways as a sum of consecutive naturals, for example, 441 + ... + 1321.

2⁷⁷⁶¹⁶¹ is an apocalyptic number.

776161 is the 881-st square number.

776161 is the 441-st centered octagonal number.

It is an amenable number.

776161 is a deficient number, since it is larger than the sum of its proper divisors (882).

776161 is an frugal number, since it uses more digits than its factorization.

776161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762 (or 881 counting only the distinct ones).

The product of its digits is 1764, while the sum is 28.

The cubic root of 776161 is about 91.9003726181.

Multiplying 776161 by its product of digits (1764), we get a square (1369148004 = 37002²).

The spelling of 776161 in words is "seven hundred seventy-six thousand, one hundred sixty-one".