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12121009 is a prime number
BaseRepresentation
bin101110001111…
…001110110001
3211210210220021
4232033032301
511100333014
61111443441
7205012135
oct56171661
924723807
1012121009
11692976a
124086581
1326850c4
1418773c5
1510e6624
hexb8f3b1

12121009 has 2 divisors, whose sum is σ = 12121010. Its totient is φ = 12121008.

The previous prime is 12120989. The next prime is 12121061. The reversal of 12121009 is 90012121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12110400 + 10609 = 3480^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121009 - 211 = 12118961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12120983 and 12121001.

It is not a weakly prime, because it can be changed into another prime (12121079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060504 + 6060505.

It is an arithmetic number, because the mean of its divisors is an integer number (6060505).

Almost surely, 212121009 is an apocalyptic number.

It is an amenable number.

12121009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121009 is an equidigital number, since it uses as much as digits as its factorization.

12121009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 12121009 is about 3481.5239479286. The cubic root of 12121009 is about 229.7098357257.

The spelling of 12121009 in words is "twelve million, one hundred twenty-one thousand, nine".