129491 has 2 divisors, whose sum is σ = 129492. Its totient is φ = 129490.

The previous prime is 129469. The next prime is 129497. The reversal of 129491 is 194921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129491 - 2¹⁰ = 128467 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129491.

It is not a weakly prime, because it can be changed into another prime (129497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64745 + 64746.

It is an arithmetic number, because the mean of its divisors is an integer number (64746).

2¹²⁹⁴⁹¹ is an apocalyptic number.

129491 is a deficient number, since it is larger than the sum of its proper divisors (1).

129491 is an equidigital number, since it uses as much as digits as its factorization.

129491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 129491 is about 359.8485792663. The cubic root of 129491 is about 50.5917685684.

It can be divided in two parts, 1 and 29491, that added together give a palindrome (29492).

The spelling of 129491 in words is "one hundred twenty-nine thousand, four hundred ninety-one".