161161277 has 2 divisors, whose sum is σ = 161161278. Its totient is φ = 161161276.

The previous prime is 161161271. The next prime is 161161303. The reversal of 161161277 is 772161161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124121881 + 37039396 = 11141^2 + 6086^2 .

It is an emirp because it is prime and its reverse (772161161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161161277 - 2⁶ = 161161213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161161271) 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, 80580638 + 80580639.

It is an arithmetic number, because the mean of its divisors is an integer number (80580639).

Almost surely, 2^161161277 is an apocalyptic number.

It is an amenable number.

161161277 is a deficient number, since it is larger than the sum of its proper divisors (1).

161161277 is an equidigital number, since it uses as much as digits as its factorization.

161161277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 32.

The square root of 161161277 is about 12694.9311538110. The cubic root of 161161277 is about 544.1937713058.

The spelling of 161161277 in words is "one hundred sixty-one million, one hundred sixty-one thousand, two hundred seventy-seven".