129140251 has 2 divisors, whose sum is σ = 129140252. Its totient is φ = 129140250.

The previous prime is 129140227. The next prime is 129140269. The reversal of 129140251 is 152041921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129140251 is a prime.

It is equal to p_7332163 and since 129140251 and 7332163 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 (129140351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64570125 + 64570126.

It is an arithmetic number, because the mean of its divisors is an integer number (64570126).

Almost surely, 2^129140251 is an apocalyptic number.

129140251 is a deficient number, since it is larger than the sum of its proper divisors (1).

129140251 is an equidigital number, since it uses as much as digits as its factorization.

129140251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 129140251 is about 11363.9892203398. The cubic root of 129140251 is about 505.4604838136.

The spelling of 129140251 in words is "one hundred twenty-nine million, one hundred forty thousand, two hundred fifty-one".