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212831225 = 5215715419
BaseRepresentation
bin11001010111110…
…00101111111001
3112211110221112222
430223320233321
5413441044400
633041413425
75163015125
oct1453705771
9484427488
10212831225
11aa157282
125b33a275
133512a749
14203a2585
1513a41185
hexcaf8bf9

212831225 has 12 divisors (see below), whose sum is σ = 264127440. Its totient is φ = 170125200.

The previous prime is 212831221. The next prime is 212831243. The reversal of 212831225 is 522138212.

It is not a de Polignac number, because 212831225 - 22 = 212831221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212831194 and 212831203.

It is not an unprimeable number, because it can be changed into a prime (212831221) 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, 36566 + ... + 41984.

It is an arithmetic number, because the mean of its divisors is an integer number (22010620).

Almost surely, 2212831225 is an apocalyptic number.

212831225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212831225 is a deficient number, since it is larger than the sum of its proper divisors (51296215).

212831225 is a wasteful number, since it uses less digits than its factorization.

212831225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000 (or 6995 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 212831225 is about 14588.7362372482. The cubic root of 212831225 is about 597.0514832237.

Adding to 212831225 its reverse (522138212), we get a palindrome (734969437).

The spelling of 212831225 in words is "two hundred twelve million, eight hundred thirty-one thousand, two hundred twenty-five".

Divisors: 1 5 25 1571 5419 7855 27095 39275 135475 8513249 42566245 212831225