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259991 is a prime number
BaseRepresentation
bin111111011110010111
3111012122022
4333132113
531304431
65323355
72131664
oct773627
9435568
10259991
11168376
1210655b
1391454
146aa6b
155207b
hex3f797

259991 has 2 divisors, whose sum is σ = 259992. Its totient is φ = 259990.

The previous prime is 259967. The next prime is 259993. The reversal of 259991 is 199952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 259991 - 210 = 258967 is a prime.

Together with 259993, 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 (259993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129995 + 129996.

It is an arithmetic number, because the mean of its divisors is an integer number (129996).

2259991 is an apocalyptic number.

259991 is a deficient number, since it is larger than the sum of its proper divisors (1).

259991 is an equidigital number, since it uses as much as digits as its factorization.

259991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290, while the sum is 35.

The square root of 259991 is about 509.8931260568. The cubic root of 259991 is about 63.8243065373.

The spelling of 259991 in words is "two hundred fifty-nine thousand, nine hundred ninety-one".