129678049 has 4 divisors (see below), whose sum is σ = 130699264. Its totient is φ = 128656836.

The previous prime is 129678037. The next prime is 129678083. The reversal of 129678049 is 940876921.

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 129678049 - 2²¹ = 127580897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129676049) 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 in 3 ways as a sum of consecutive naturals, for example, 510417 + ... + 510670.

It is an arithmetic number, because the mean of its divisors is an integer number (32674816).

Almost surely, 2^129678049 is an apocalyptic number.

It is an amenable number.

129678049 is a deficient number, since it is larger than the sum of its proper divisors (1021215).

129678049 is a wasteful number, since it uses less digits than its factorization.

129678049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021214.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 129678049 is about 11387.6270135617. The cubic root of 129678049 is about 506.1611668751.

The spelling of 129678049 in words is "one hundred twenty-nine million, six hundred seventy-eight thousand, forty-nine".