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161312 = 25712
BaseRepresentation
bin100111011000100000
322012021112
4213120200
520130222
63242452
71241204
oct473040
9265245
10161312
11100218
1279428
1358568
1442b04
1532be2
hex27620

161312 has 18 divisors (see below), whose sum is σ = 322119. Its totient is φ = 79520.

The previous prime is 161309. The next prime is 161323. The reversal of 161312 is 213161.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 80656 + 80656 = 284^2 + 284^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=284.

It is a super-2 number, since 2×1613122 = 52043122688, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2237 + ... + 2307.

2161312 is an apocalyptic number.

It is an amenable number.

161312 is a deficient number, since it is larger than the sum of its proper divisors (160807).

161312 is an frugal number, since it uses more digits than its factorization.

161312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 73 counting only the distinct ones).

The product of its digits is 36, while the sum is 14.

The square root of 161312 is about 401.6366517140. The cubic root of 161312 is about 54.4363367383.

Adding to 161312 its reverse (213161), we get a palindrome (374473).

The spelling of 161312 in words is "one hundred sixty-one thousand, three hundred twelve".

Divisors: 1 2 4 8 16 32 71 142 284 568 1136 2272 5041 10082 20164 40328 80656 161312