195129 has 24 divisors (see below), whose sum is σ = 323232. Its totient is φ = 116640.

The previous prime is 195127. The next prime is 195131. The reversal of 195129 is 921591.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (195127) and next prime (195131).

It is not a de Polignac number, because 195129 - 2¹ = 195127 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (195121) 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 in 23 ways as a sum of consecutive naturals, for example, 2637 + ... + 2709.

It is an arithmetic number, because the mean of its divisors is an integer number (13468).

2¹⁹⁵¹²⁹ is an apocalyptic number.

It is an amenable number.

195129 is a deficient number, since it is larger than the sum of its proper divisors (128103).

195129 is an equidigital number, since it uses as much as digits as its factorization.

195129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 87 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 195129 is about 441.7340829051. The cubic root of 195129 is about 58.0016844537.

195129 divided by its sum of digits (27) gives a palindrome (7227).

It can be divided in two parts, 195 and 129, that added together give a square (324 = 18²).

The spelling of 195129 in words is "one hundred ninety-five thousand, one hundred twenty-nine".