129001511 has 4 divisors (see below), whose sum is σ = 131746272. Its totient is φ = 126256752.

The previous prime is 129001501. The next prime is 129001513. The reversal of 129001511 is 115100921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115100921 = 13 ⋅8853917.

It is a cyclic number.

It is not a de Polignac number, because 129001511 - 2¹⁸ = 128739367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129001513) 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, 1372310 + ... + 1372403.

It is an arithmetic number, because the mean of its divisors is an integer number (32936568).

Almost surely, 2^129001511 is an apocalyptic number.

129001511 is a deficient number, since it is larger than the sum of its proper divisors (2744761).

129001511 is an equidigital number, since it uses as much as digits as its factorization.

129001511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744760.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 129001511 is about 11357.8832094717. The cubic root of 129001511 is about 505.2794075147.

The spelling of 129001511 in words is "one hundred twenty-nine million, one thousand, five hundred eleven".