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212431 = 792689
BaseRepresentation
bin110011110111001111
3101210101211
4303313033
523244211
64315251
71543222
oct636717
9353354
10212431
1113566a
12a2b27
13758cb
14575b9
1542e21
hex33dcf

212431 has 4 divisors (see below), whose sum is σ = 215200. Its totient is φ = 209664.

The previous prime is 212423. The next prime is 212437. The reversal of 212431 is 134212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212431 - 23 = 212423 is a prime.

It is a super-2 number, since 2×2124312 = 90253859522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212437) 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 3 ways as a sum of consecutive naturals, for example, 1266 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (53800).

2212431 is an apocalyptic number.

212431 is the 292-nd centered pentagonal number.

212431 is a deficient number, since it is larger than the sum of its proper divisors (2769).

212431 is an equidigital number, since it uses as much as digits as its factorization.

212431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768.

The product of its digits is 48, while the sum is 13.

The square root of 212431 is about 460.9023757804. The cubic root of 212431 is about 59.6677000470.

Adding to 212431 its reverse (134212), we get a palindrome (346643).

The spelling of 212431 in words is "two hundred twelve thousand, four hundred thirty-one".

Divisors: 1 79 2689 212431