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161518169 is a prime number
BaseRepresentation
bin10011010000010…
…01001001011001
3102020220222021102
421220021021121
5312322040134
624005521145
74000611311
oct1150111131
9366828242
10161518169
1183199a9a
12461131b5
13276027a7
1417646441
15e2a737e
hex9a09259

161518169 has 2 divisors, whose sum is σ = 161518170. Its totient is φ = 161518168.

The previous prime is 161518141. The next prime is 161518171. The reversal of 161518169 is 961815161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156625225 + 4892944 = 12515^2 + 2212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-161518169 is a prime.

It is a super-2 number, since 2×1615181692 = 52176237834225122, which contains 22 as substring.

Together with 161518171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161518129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80759084 + 80759085.

It is an arithmetic number, because the mean of its divisors is an integer number (80759085).

Almost surely, 2161518169 is an apocalyptic number.

It is an amenable number.

161518169 is a deficient number, since it is larger than the sum of its proper divisors (1).

161518169 is an equidigital number, since it uses as much as digits as its factorization.

161518169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 38.

The square root of 161518169 is about 12708.9798567784. The cubic root of 161518169 is about 544.5951812423.

The spelling of 161518169 in words is "one hundred sixty-one million, five hundred eighteen thousand, one hundred sixty-nine".