129458885 has 4 divisors (see below), whose sum is σ = 155350668. Its totient is φ = 103567104.

The previous prime is 129458863. The next prime is 129458899. The reversal of 129458885 is 588854921.

It is a Cunningham number, because it is equal to 11378²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588854921 = 23333 ⋅25237.

It can be written as a sum of positive squares in 2 ways, for example, as 46594276 + 82864609 = 6826^2 + 9103^2 .

It is a cyclic number.

It is not a de Polignac number, because 129458885 - 2⁸ = 129458629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12945884 + ... + 12945893.

It is an arithmetic number, because the mean of its divisors is an integer number (38837667).

Almost surely, 2^129458885 is an apocalyptic number.

It is an amenable number.

129458885 is a deficient number, since it is larger than the sum of its proper divisors (25891783).

129458885 is an equidigital number, since it uses as much as digits as its factorization.

129458885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25891782.

The product of its digits is 921600, while the sum is 50.

The square root of 129458885 is about 11378.0000439445. Note that the first 4 decimals coincide. The cubic root of 129458885 is about 505.8758580925.

The spelling of 129458885 in words is "one hundred twenty-nine million, four hundred fifty-eight thousand, eight hundred eighty-five".