129489371 has 18 divisors (see below), whose sum is σ = 146334852. Its totient is φ = 113634720.

The previous prime is 129489331. The next prime is 129489407. The reversal of 129489371 is 173984921.

It is not a de Polignac number, because 129489371 - 2²² = 125295067 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129489331) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1773791 + ... + 1773863.

It is an arithmetic number, because the mean of its divisors is an integer number (8129714).

Almost surely, 2^129489371 is an apocalyptic number.

129489371 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129489371 is a deficient number, since it is larger than the sum of its proper divisors (16845481).

129489371 is an frugal number, since it uses more digits than its factorization.

129489371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 131 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 129489371 is about 11379.3396557094. The cubic root of 129489371 is about 505.9155641891.

Multiplying 129489371 by its sum of digits (44), we get a square (5697532324 = 75482²).

The spelling of 129489371 in words is "one hundred twenty-nine million, four hundred eighty-nine thousand, three hundred seventy-one".