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BaseRepresentation
bin10010100110110…
…010000000110100
3210202101011211012
4102212302000310
51114402444322
650550331352
710510166264
oct2246620064
9722334735
10312156212
11150227645
1288659b58
134c895c24
142d6597a4
151c610ae2
hex129b2034

312156212 has 6 divisors (see below), whose sum is σ = 546273378. Its totient is φ = 156078104.

The previous prime is 312156209. The next prime is 312156217. The reversal of 312156212 is 212651213.

It can be written as a sum of positive squares in only one way, i.e., 270734116 + 41422096 = 16454^2 + 6436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312156217) 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, 39019523 + ... + 39019530.

It is an arithmetic number, because the mean of its divisors is an integer number (91045563).

Almost surely, 2312156212 is an apocalyptic number.

It is an amenable number.

312156212 is a deficient number, since it is larger than the sum of its proper divisors (234117166).

312156212 is a wasteful number, since it uses less digits than its factorization.

312156212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78039057 (or 78039055 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 312156212 is about 17667.9430608093. The cubic root of 312156212 is about 678.3554637172.

The spelling of 312156212 in words is "three hundred twelve million, one hundred fifty-six thousand, two hundred twelve".

Divisors: 1 2 4 78039053 156078106 312156212