129282479 has 4 divisors (see below), whose sum is σ = 136086840. Its totient is φ = 122478120.

The previous prime is 129282469. The next prime is 129282481. The reversal of 129282479 is 974282921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 974282921 = 23 ⋅42360127.

It is a cyclic number.

It is not a de Polignac number, because 129282479 - 2¹⁶ = 129216943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129282449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3402152 + ... + 3402189.

It is an arithmetic number, because the mean of its divisors is an integer number (34021710).

Almost surely, 2^129282479 is an apocalyptic number.

129282479 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129282479 is a deficient number, since it is larger than the sum of its proper divisors (6804361).

129282479 is an equidigital number, since it uses as much as digits as its factorization.

129282479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804360.

The product of its digits is 145152, while the sum is 44.

The square root of 129282479 is about 11370.2453359635. The cubic root of 129282479 is about 505.6459778975.

The spelling of 129282479 in words is "one hundred twenty-nine million, two hundred eighty-two thousand, four hundred seventy-nine".