129256701 has 32 divisors (see below), whose sum is σ = 204496896. Its totient is φ = 71064000.

The previous prime is 129256693. The next prime is 129256703. The reversal of 129256701 is 107652921.

It is not a de Polignac number, because 129256701 - 2³ = 129256693 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129256703) 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 31 ways as a sum of consecutive naturals, for example, 136891 + ... + 137831.

It is an arithmetic number, because the mean of its divisors is an integer number (6390528).

Almost surely, 2^129256701 is an apocalyptic number.

It is an amenable number.

129256701 is a deficient number, since it is larger than the sum of its proper divisors (75240195).

129256701 is a wasteful number, since it uses less digits than its factorization.

129256701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 129256701 is about 11369.1117067254. Note that the first 3 decimals coincide. The cubic root of 129256701 is about 505.6123682686.

The spelling of 129256701 in words is "one hundred twenty-nine million, two hundred fifty-six thousand, seven hundred one".