129242783 has 4 divisors (see below), whose sum is σ = 132395088. Its totient is φ = 126090480.

The previous prime is 129242767. The next prime is 129242797. The reversal of 129242783 is 387242921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 387242921 = 13 ⋅29787917.

It is a cyclic number.

It is not a de Polignac number, because 129242783 - 2⁴ = 129242767 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 (129242723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1576091 + ... + 1576172.

It is an arithmetic number, because the mean of its divisors is an integer number (33098772).

Almost surely, 2^129242783 is an apocalyptic number.

129242783 is a deficient number, since it is larger than the sum of its proper divisors (3152305).

129242783 is an equidigital number, since it uses as much as digits as its factorization.

129242783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152304.

The product of its digits is 48384, while the sum is 38.

The square root of 129242783 is about 11368.4995931741. The cubic root of 129242783 is about 505.5942199754.

The spelling of 129242783 in words is "one hundred twenty-nine million, two hundred forty-two thousand, seven hundred eighty-three".