161544569 has 2 divisors, whose sum is σ = 161544570. Its totient is φ = 161544568.

The previous prime is 161544563. The next prime is 161544589. The reversal of 161544569 is 965445161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112614544 + 48930025 = 10612^2 + 6995^2 .

It is a cyclic number.

It is not a de Polignac number, because 161544569 - 2²⁴ = 144767353 is a prime.

It is a super-2 number, since 2×161544569² = 52193295546791522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161544563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80772284 + 80772285.

It is an arithmetic number, because the mean of its divisors is an integer number (80772285).

Almost surely, 2^161544569 is an apocalyptic number.

It is an amenable number.

161544569 is a deficient number, since it is larger than the sum of its proper divisors (1).

161544569 is an equidigital number, since it uses as much as digits as its factorization.

161544569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The square root of 161544569 is about 12710.0184500259. The cubic root of 161544569 is about 544.6248508240.

The spelling of 161544569 in words is "one hundred sixty-one million, five hundred forty-four thousand, five hundred sixty-nine".