129289401 has 12 divisors (see below), whose sum is σ = 187344612. Its totient is φ = 85919136.

The previous prime is 129289387. The next prime is 129289409. The reversal of 129289401 is 104982921.

It can be written as a sum of positive squares in 2 ways, for example, as 24206400 + 105083001 = 4920^2 + 10251^2 .

It is not a de Polignac number, because 129289401 - 2¹⁹ = 128765113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129289409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19806 + ... + 25511.

It is an arithmetic number, because the mean of its divisors is an integer number (15612051).

Almost surely, 2^129289401 is an apocalyptic number.

It is an amenable number.

129289401 is a deficient number, since it is larger than the sum of its proper divisors (58055211).

129289401 is a wasteful number, since it uses less digits than its factorization.

129289401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45640 (or 45637 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 129289401 is about 11370.5497228586. The cubic root of 129289401 is about 505.6550021134.

The spelling of 129289401 in words is "one hundred twenty-nine million, two hundred eighty-nine thousand, four hundred one".