129154247 has 2 divisors, whose sum is σ = 129154248. Its totient is φ = 129154246.

The previous prime is 129154231. The next prime is 129154279. The reversal of 129154247 is 742451921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129154247 - 2⁴ = 129154231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129154217) 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, 64577123 + 64577124.

It is an arithmetic number, because the mean of its divisors is an integer number (64577124).

Almost surely, 2^129154247 is an apocalyptic number.

129154247 is a deficient number, since it is larger than the sum of its proper divisors (1).

129154247 is an equidigital number, since it uses as much as digits as its factorization.

129154247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 129154247 is about 11364.6050085342. The cubic root of 129154247 is about 505.4787434688.

The spelling of 129154247 in words is "one hundred twenty-nine million, one hundred fifty-four thousand, two hundred forty-seven".