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BaseRepresentation
bin100111100001010111
322020001112
4213201113
520140004
63245235
71242644
oct474127
9266045
10161879
11100693
127981b
13588b3
1442dcb
1532e6e
hex27857

161879 has 2 divisors, whose sum is σ = 161880. Its totient is φ = 161878.

The previous prime is 161873. The next prime is 161881. The reversal of 161879 is 978161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-161879 is a prime.

It is a Sophie Germain prime.

Together with 161881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80939 + 80940.

It is an arithmetic number, because the mean of its divisors is an integer number (80940).

2161879 is an apocalyptic number.

161879 is a deficient number, since it is larger than the sum of its proper divisors (1).

161879 is an equidigital number, since it uses as much as digits as its factorization.

161879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 161879 is about 402.3418944132. The cubic root of 161879 is about 54.5000420840.

The spelling of 161879 in words is "one hundred sixty-one thousand, eight hundred seventy-nine".