161776061 has 2 divisors, whose sum is σ = 161776062. Its totient is φ = 161776060.

The previous prime is 161776057. The next prime is 161776067. The reversal of 161776061 is 160677161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155475961 + 6300100 = 12469^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 161776061 - 2² = 161776057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_9068417 and since 161776061 and 9068417 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161776067) 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, 80888030 + 80888031.

It is an arithmetic number, because the mean of its divisors is an integer number (80888031).

Almost surely, 2^161776061 is an apocalyptic number.

It is an amenable number.

161776061 is a deficient number, since it is larger than the sum of its proper divisors (1).

161776061 is an equidigital number, since it uses as much as digits as its factorization.

161776061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 161776061 is about 12719.1218643427. The cubic root of 161776061 is about 544.8848742601.

The spelling of 161776061 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, sixty-one".