129700321 has 2 divisors, whose sum is σ = 129700322. Its totient is φ = 129700320.

The previous prime is 129700313. The next prime is 129700331. The reversal of 129700321 is 123007921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109495296 + 20205025 = 10464^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 129700321 - 2³ = 129700313 is a prime.

It is equal to p_7362214 and since 129700321 and 7362214 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (129700301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64850160 + 64850161.

It is an arithmetic number, because the mean of its divisors is an integer number (64850161).

Almost surely, 2^129700321 is an apocalyptic number.

It is an amenable number.

129700321 is a deficient number, since it is larger than the sum of its proper divisors (1).

129700321 is an equidigital number, since it uses as much as digits as its factorization.

129700321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 129700321 is about 11388.6048750494. The cubic root of 129700321 is about 506.1901426765.

The spelling of 129700321 in words is "one hundred twenty-nine million, seven hundred thousand, three hundred twenty-one".