129466789 has 2 divisors, whose sum is σ = 129466790. Its totient is φ = 129466788.
The previous prime is 129466783. The next prime is 129466801. The reversal of 129466789 is 987664921.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 99161764 + 30305025 = 9958^2 + 5505^2 .
It is a cyclic number.
It is not a de Polignac number, because 129466789 - 27 = 129466661 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (129466783) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64733394 + 64733395.
It is an arithmetic number, because the mean of its divisors is an integer number (64733395).
Almost surely, 2129466789 is an apocalyptic number.
It is an amenable number.
129466789 is a deficient number, since it is larger than the sum of its proper divisors (1).
129466789 is an equidigital number, since it uses as much as digits as its factorization.
129466789 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1306368, while the sum is 52.
The square root of 129466789 is about 11378.3473756078. The cubic root of 129466789 is about 505.8861531536.
The spelling of 129466789 in words is "one hundred twenty-nine million, four hundred sixty-six thousand, seven hundred eighty-nine".
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