129919 has 2 divisors, whose sum is σ = 129920. Its totient is φ = 129918.

The previous prime is 129917. The next prime is 129937. The reversal of 129919 is 919921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129919 - 2¹ = 129917 is a prime.

It is a super-2 number, since 2×129919² = 33757893122, which contains 22 as substring.

Together with 129917, it forms a pair of twin primes.

It is an Ulam number.

129919 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64959 + 64960.

It is an arithmetic number, because the mean of its divisors is an integer number (64960).

2¹²⁹⁹¹⁹ is an apocalyptic number.

129919 is a deficient number, since it is larger than the sum of its proper divisors (1).

129919 is an equidigital number, since it uses as much as digits as its factorization.

129919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 31.

The square root of 129919 is about 360.4427832542. The cubic root of 129919 is about 50.6474467343.

The spelling of 129919 in words is "one hundred twenty-nine thousand, nine hundred nineteen".