129071851 has 2 divisors, whose sum is σ = 129071852. Its totient is φ = 129071850.

The previous prime is 129071843. The next prime is 129071857. The reversal of 129071851 is 158170921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129071851 - 2³ = 129071843 is a prime.

It is not a weakly prime, because it can be changed into another prime (129071857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64535925 + 64535926.

It is an arithmetic number, because the mean of its divisors is an integer number (64535926).

Almost surely, 2^129071851 is an apocalyptic number.

129071851 is a deficient number, since it is larger than the sum of its proper divisors (1).

129071851 is an equidigital number, since it uses as much as digits as its factorization.

129071851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 129071851 is about 11360.9793151823. The cubic root of 129071851 is about 505.3712278750.

The spelling of 129071851 in words is "one hundred twenty-nine million, seventy-one thousand, eight hundred fifty-one".