161873017 has 2 divisors, whose sum is σ = 161873018. Its totient is φ = 161873016.

The previous prime is 161873009. The next prime is 161873021. The reversal of 161873017 is 710378161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92467456 + 69405561 = 9616^2 + 8331^2 .

It is a cyclic number.

It is not a de Polignac number, because 161873017 - 2³ = 161873009 is a prime.

It is not a weakly prime, because it can be changed into another prime (161873087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80936508 + 80936509.

It is an arithmetic number, because the mean of its divisors is an integer number (80936509).

Almost surely, 2^161873017 is an apocalyptic number.

It is an amenable number.

161873017 is a deficient number, since it is larger than the sum of its proper divisors (1).

161873017 is an equidigital number, since it uses as much as digits as its factorization.

161873017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 161873017 is about 12722.9327200925. The cubic root of 161873017 is about 544.9937064055.

It can be divided in two parts, 1618 and 73017, that multiplied together give a triangular number (118141506 = T₁₅₃₇₁).

The spelling of 161873017 in words is "one hundred sixty-one million, eight hundred seventy-three thousand, seventeen".