161845069 has 2 divisors, whose sum is σ = 161845070. Its totient is φ = 161845068.

The previous prime is 161845039. The next prime is 161845147. The reversal of 161845069 is 960548161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111576969 + 50268100 = 10563^2 + 7090^2 .

It is a cyclic number.

It is not a de Polignac number, because 161845069 - 2⁷ = 161844941 is a prime.

It is a super-2 number, since 2×161845069² = 52387652719229522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161845039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80922534 + 80922535.

It is an arithmetic number, because the mean of its divisors is an integer number (80922535).

Almost surely, 2^161845069 is an apocalyptic number.

It is an amenable number.

161845069 is a deficient number, since it is larger than the sum of its proper divisors (1).

161845069 is an equidigital number, since it uses as much as digits as its factorization.

161845069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 161845069 is about 12721.8343410060. The cubic root of 161845069 is about 544.9623395125.

The spelling of 161845069 in words is "one hundred sixty-one million, eight hundred forty-five thousand, sixty-nine".