129389111 has 4 divisors (see below), whose sum is σ = 132886152. Its totient is φ = 125892072.

The previous prime is 129389089. The next prime is 129389119. The reversal of 129389111 is 111983921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111983921 = 7 ⋅15997703.

It is a cyclic number.

It is not a de Polignac number, because 129389111 - 2¹⁸ = 129126967 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 (129389119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1748465 + ... + 1748538.

It is an arithmetic number, because the mean of its divisors is an integer number (33221538).

Almost surely, 2^129389111 is an apocalyptic number.

129389111 is a deficient number, since it is larger than the sum of its proper divisors (3497041).

129389111 is an equidigital number, since it uses as much as digits as its factorization.

129389111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497040.

The product of its digits is 3888, while the sum is 35.

The square root of 129389111 is about 11374.9334503548. The cubic root of 129389111 is about 505.7849583824.

The spelling of 129389111 in words is "one hundred twenty-nine million, three hundred eighty-nine thousand, one hundred eleven".