133999 has 2 divisors, whose sum is σ = 134000. Its totient is φ = 133998.

The previous prime is 133993. The next prime is 134033. The reversal of 133999 is 999331.

It is a happy number.

It is an a-pointer prime, because the next prime (134033) can be obtained adding 133999 to its sum of digits (34).

It is a weak prime.

It is an emirp because it is prime and its reverse (999331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133999 - 2⁵ = 133967 is a prime.

133999 is a modest number, since divided by 999 gives 133 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66999 + 67000.

It is an arithmetic number, because the mean of its divisors is an integer number (67000).

2¹³³⁹⁹⁹ is an apocalyptic number.

133999 is a deficient number, since it is larger than the sum of its proper divisors (1).

133999 is an equidigital number, since it uses as much as digits as its factorization.

133999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6561, while the sum is 34.

The square root of 133999 is about 366.0587384560. The cubic root of 133999 is about 51.1721721745.

The spelling of 133999 in words is "one hundred thirty-three thousand, nine hundred ninety-nine".