129951 has 8 divisors (see below), whose sum is σ = 192560. Its totient is φ = 86616.

The previous prime is 129937. The next prime is 129953. The reversal of 129951 is 159921.

It is a happy number.

It is not a de Polignac number, because 129951 - 2⁵ = 129919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4813 = 129951 / (1 + 2 + 9 + 9 + 5 + 1).

It is a Duffinian number.

129951 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (24070).

2¹²⁹⁹⁵¹ is an apocalyptic number.

129951 is a deficient number, since it is larger than the sum of its proper divisors (62609).

129951 is an equidigital number, since it uses as much as digits as its factorization.

129951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4822 (or 4816 counting only the distinct ones).

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

The square root of 129951 is about 360.4871703681. The cubic root of 129951 is about 50.6516046718.

It can be divided in two parts, 12995 and 1, that added together give a square (12996 = 114²).

The spelling of 129951 in words is "one hundred twenty-nine thousand, nine hundred fifty-one".