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161043156 = 22324473421
BaseRepresentation
bin10011001100101…
…01001011010100
3102020000211200100
421212111023110
5312211340111
623551414100
73663562401
oct1146251324
9366024610
10161043156
11829a511a
1245b24330
1327497511
14175612a8
15e211756
hex99952d4

161043156 has 18 divisors (see below), whose sum is σ = 407081402. Its totient is φ = 53681040.

The previous prime is 161043151. The next prime is 161043163. The reversal of 161043156 is 651340161.

161043156 is a `hidden beast` number, since 1 + 610 + 43 + 1 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 161036100 + 7056 = 12690^2 + 84^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161043151) 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 in 5 ways as a sum of consecutive naturals, for example, 2236675 + ... + 2236746.

Almost surely, 2161043156 is an apocalyptic number.

It is an amenable number.

161043156 is an abundant number, since it is smaller than the sum of its proper divisors (246038246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161043156 is a wasteful number, since it uses less digits than its factorization.

161043156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473431 (or 4473426 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 161043156 is about 12690.2780111391. The cubic root of 161043156 is about 544.0607856313.

The spelling of 161043156 in words is "one hundred sixty-one million, forty-three thousand, one hundred fifty-six".

Divisors: 1 2 3 4 6 9 12 18 36 4473421 8946842 13420263 17893684 26840526 40260789 53681052 80521578 161043156