128925829 has 2 divisors, whose sum is σ = 128925830. Its totient is φ = 128925828.

The previous prime is 128925803. The next prime is 128925857. The reversal of 128925829 is 928529821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125484804 + 3441025 = 11202^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 128925829 - 2¹³ = 128917637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128925859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64462914 + 64462915.

It is an arithmetic number, because the mean of its divisors is an integer number (64462915).

Almost surely, 2^128925829 is an apocalyptic number.

It is an amenable number.

128925829 is a deficient number, since it is larger than the sum of its proper divisors (1).

128925829 is an equidigital number, since it uses as much as digits as its factorization.

128925829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The square root of 128925829 is about 11354.5510259103. The cubic root of 128925829 is about 505.1805765359.

It can be divided in two parts, 12892 and 5829, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 128925829 in words is "one hundred twenty-eight million, nine hundred twenty-five thousand, eight hundred twenty-nine".