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122891 is a prime number
BaseRepresentation
bin11110000000001011
320020120112
4132000023
512413031
62344535
71021166
oct360013
9206515
10122891
118436a
125b14b
1343c22
1432add
152662b
hex1e00b

122891 has 2 divisors, whose sum is σ = 122892. Its totient is φ = 122890.

The previous prime is 122887. The next prime is 122921. The reversal of 122891 is 198221.

It is a weak prime.

It is an emirp because it is prime and its reverse (198221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122891 - 22 = 122887 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (122861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61445 + 61446.

It is an arithmetic number, because the mean of its divisors is an integer number (61446).

2122891 is an apocalyptic number.

122891 is a deficient number, since it is larger than the sum of its proper divisors (1).

122891 is an equidigital number, since it uses as much as digits as its factorization.

122891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 122891 is about 350.5581264213. The cubic root of 122891 is about 49.7172035387.

The spelling of 122891 in words is "one hundred twenty-two thousand, eight hundred ninety-one".