129378349 has 2 divisors, whose sum is σ = 129378350. Its totient is φ = 129378348.

The previous prime is 129378343. The next prime is 129378413. The reversal of 129378349 is 943873921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128981449 + 396900 = 11357^2 + 630^2 .

It is an emirp because it is prime and its reverse (943873921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129378349 - 2⁵ = 129378317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129378299 and 129378308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129378343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64689174 + 64689175.

It is an arithmetic number, because the mean of its divisors is an integer number (64689175).

Almost surely, 2^129378349 is an apocalyptic number.

It is an amenable number.

129378349 is a deficient number, since it is larger than the sum of its proper divisors (1).

129378349 is an equidigital number, since it uses as much as digits as its factorization.

129378349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 129378349 is about 11374.4603828050. The cubic root of 129378349 is about 505.7709350266.

The spelling of 129378349 in words is "one hundred twenty-nine million, three hundred seventy-eight thousand, three hundred forty-nine".