129684397 has 2 divisors, whose sum is σ = 129684398. Its totient is φ = 129684396.

The previous prime is 129684391. The next prime is 129684403. The reversal of 129684397 is 793486921.

It is a balanced prime because it is at equal distance from previous prime (129684391) and next prime (129684403).

It can be written as a sum of positive squares in only one way, i.e., 119115396 + 10569001 = 10914^2 + 3251^2 .

It is a cyclic number.

It is not a de Polignac number, because 129684397 - 2³ = 129684389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129684397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129684391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64842198 + 64842199.

It is an arithmetic number, because the mean of its divisors is an integer number (64842199).

Almost surely, 2^129684397 is an apocalyptic number.

It is an amenable number.

129684397 is a deficient number, since it is larger than the sum of its proper divisors (1).

129684397 is an equidigital number, since it uses as much as digits as its factorization.

129684397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 129684397 is about 11387.9057337159. The cubic root of 129684397 is about 506.1694259410.

The spelling of 129684397 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, three hundred ninety-seven".