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12212191 is a prime number
BaseRepresentation
bin101110100101…
…011111011111
3211222102222101
4232211133133
511111242231
61113425531
7205542025
oct56453737
924872871
1012212191
116991222
12410b2a7
1326b7764
14189c715
151113661
hexba57df

12212191 has 2 divisors, whose sum is σ = 12212192. Its totient is φ = 12212190.

The previous prime is 12212177. The next prime is 12212197. The reversal of 12212191 is 19121221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12212191 - 25 = 12212159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106095 + 6106096.

It is an arithmetic number, because the mean of its divisors is an integer number (6106096).

Almost surely, 212212191 is an apocalyptic number.

12212191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212191 is an equidigital number, since it uses as much as digits as its factorization.

12212191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 19.

The square root of 12212191 is about 3494.5945401434. The cubic root of 12212191 is about 230.2844055784.

It can be divided in two parts, 12212 and 191, that added together give a triangular number (12403 = T157).

The spelling of 12212191 in words is "twelve million, two hundred twelve thousand, one hundred ninety-one".