129148399 has 2 divisors, whose sum is σ = 129148400. Its totient is φ = 129148398.

The previous prime is 129148391. The next prime is 129148403. The reversal of 129148399 is 993841921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129148399 - 2³ = 129148391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129148391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64574199 + 64574200.

It is an arithmetic number, because the mean of its divisors is an integer number (64574200).

Almost surely, 2^129148399 is an apocalyptic number.

129148399 is a deficient number, since it is larger than the sum of its proper divisors (1).

129148399 is an equidigital number, since it uses as much as digits as its factorization.

129148399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 129148399 is about 11364.3477155532. The cubic root of 129148399 is about 505.4711141305.

The spelling of 129148399 in words is "one hundred twenty-nine million, one hundred forty-eight thousand, three hundred ninety-nine".