129778201 has 4 divisors (see below), whose sum is σ = 148317952. Its totient is φ = 111238452.

The previous prime is 129778147. The next prime is 129778211. The reversal of 129778201 is 102877921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129778201 - 2⁷ = 129778073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129778211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9269865 + ... + 9269878.

It is an arithmetic number, because the mean of its divisors is an integer number (37079488).

Almost surely, 2^129778201 is an apocalyptic number.

It is an amenable number.

129778201 is a deficient number, since it is larger than the sum of its proper divisors (18539751).

129778201 is an equidigital number, since it uses as much as digits as its factorization.

129778201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18539750.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 129778201 is about 11392.0235691470. The cubic root of 129778201 is about 506.2914382379.

The spelling of 129778201 in words is "one hundred twenty-nine million, seven hundred seventy-eight thousand, two hundred one".