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129704821 is a prime number
BaseRepresentation
bin1111011101100…
…10001101110101
3100001001200120021
413232302031311
5231201023241
620512005141
73133321111
oct756621565
9301050507
10129704821
1167240174
12375307b1
1320b4431c
1413324741
15b5c10d1
hex7bb2375

129704821 has 2 divisors, whose sum is σ = 129704822. Its totient is φ = 129704820.

The previous prime is 129704801. The next prime is 129704851. The reversal of 129704821 is 128407921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94361796 + 35343025 = 9714^2 + 5945^2 .

It is a cyclic number.

It is not a de Polignac number, because 129704821 - 27 = 129704693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129704801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64852410 + 64852411.

It is an arithmetic number, because the mean of its divisors is an integer number (64852411).

Almost surely, 2129704821 is an apocalyptic number.

It is an amenable number.

129704821 is a deficient number, since it is larger than the sum of its proper divisors (1).

129704821 is an equidigital number, since it uses as much as digits as its factorization.

129704821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 129704821 is about 11388.8024392383. The cubic root of 129704821 is about 506.1959967595.

The spelling of 129704821 in words is "one hundred twenty-nine million, seven hundred four thousand, eight hundred twenty-one".