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671999 is a prime number
BaseRepresentation
bin10100100000011111111
31021010210212
42210003333
5133000444
622223035
75466116
oct2440377
91233725
10671999
11419979
12284a7b
131a6b43
14136c7d
15d419e
hexa40ff

671999 has 2 divisors, whose sum is σ = 672000. Its totient is φ = 671998.

The previous prime is 671981. The next prime is 672019. The reversal of 671999 is 999176.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671999 - 28 = 671743 is a prime.

It is a Chen prime.

671999 is a modest number, since divided by 999 gives 671 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335999 + 336000.

It is an arithmetic number, because the mean of its divisors is an integer number (336000).

2671999 is an apocalyptic number.

671999 is a deficient number, since it is larger than the sum of its proper divisors (1).

671999 is an equidigital number, since it uses as much as digits as its factorization.

671999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 41.

The square root of 671999 is about 819.7554513390. The cubic root of 671999 is about 87.5903393501.

The spelling of 671999 in words is "six hundred seventy-one thousand, nine hundred ninety-nine".