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312222213 = 32149923143
BaseRepresentation
bin10010100111000…
…010001000000101
3210202111112100200
4102213002020011
51114412102323
650552001113
710510562562
oct2247021005
9722445320
10312222213
11150272196
1288690199
134c8b9c94
142d675869
151c625443
hex129c2205

312222213 has 12 divisors (see below), whose sum is σ = 451308000. Its totient is φ = 208000296.

The previous prime is 312222203. The next prime is 312222227.

312222213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 312222213 - 28 = 312221957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312222203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1920 + ... + 25062.

It is an arithmetic number, because the mean of its divisors is an integer number (37609000).

Almost surely, 2312222213 is an apocalyptic number.

It is an amenable number.

312222213 is a deficient number, since it is larger than the sum of its proper divisors (139085787).

312222213 is a wasteful number, since it uses less digits than its factorization.

312222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24648 (or 24645 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 312222213 is about 17669.8107799716. The cubic root of 312222213 is about 678.4032698926.

The spelling of 312222213 in words is "three hundred twelve million, two hundred twenty-two thousand, two hundred thirteen".

Divisors: 1 3 9 1499 4497 13491 23143 69429 208287 34691357 104074071 312222213