129026047 has 4 divisors (see below), whose sum is σ = 129052000. Its totient is φ = 129000096.

The previous prime is 129026011. The next prime is 129026069. The reversal of 129026047 is 740620921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740620921 = 5387 ⋅137483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129026047 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 (129026077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2922 + ... + 16327.

It is an arithmetic number, because the mean of its divisors is an integer number (32263000).

Almost surely, 2^129026047 is an apocalyptic number.

129026047 is a deficient number, since it is larger than the sum of its proper divisors (25953).

129026047 is an equidigital number, since it uses as much as digits as its factorization.

129026047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25952.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 129026047 is about 11358.9632889626. The cubic root of 129026047 is about 505.3114400843.

Adding to 129026047 its reverse (740620921), we get a palindrome (869646968).

The spelling of 129026047 in words is "one hundred twenty-nine million, twenty-six thousand, forty-seven".