129026601 has 40 divisors (see below), whose sum is σ = 211701600. Its totient is φ = 77664960.

The previous prime is 129026581. The next prime is 129026603. The reversal of 129026601 is 106620921.

It is not a de Polignac number, because 129026601 - 2⁶ = 129026537 is a prime.

It is a super-2 number, since 2×129026601² = 33295727531226402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129026603) 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 39 ways as a sum of consecutive naturals, for example, 159085 + ... + 159893.

It is an arithmetic number, because the mean of its divisors is an integer number (5292540).

Almost surely, 2^129026601 is an apocalyptic number.

129026601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129026601 is a deficient number, since it is larger than the sum of its proper divisors (82674999).

129026601 is a wasteful number, since it uses less digits than its factorization.

129026601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011 (or 1002 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 129026601 is about 11358.9876749647. The cubic root of 129026601 is about 505.3121633029.

It can be divided in two parts, 12902 and 6601, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 129026601 in words is "one hundred twenty-nine million, twenty-six thousand, six hundred one".