161000771 has 2 divisors, whose sum is σ = 161000772. Its totient is φ = 161000770.

The previous prime is 161000747. The next prime is 161000783. The reversal of 161000771 is 177000161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161000771 - 2¹⁴ = 160984387 is a prime.

It is a super-4 number, since 4×161000771⁴ (a number of 34 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (161000171) 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, 80500385 + 80500386.

It is an arithmetic number, because the mean of its divisors is an integer number (80500386).

Almost surely, 2^161000771 is an apocalyptic number.

161000771 is a deficient number, since it is larger than the sum of its proper divisors (1).

161000771 is an equidigital number, since it uses as much as digits as its factorization.

161000771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 23.

The square root of 161000771 is about 12688.6079220693. The cubic root of 161000771 is about 544.0130509322.

The spelling of 161000771 in words is "one hundred sixty-one million, seven hundred seventy-one", and thus it is an aban number.