129491265 has 24 divisors (see below), whose sum is σ = 216599040. Its totient is φ = 66055264.

The previous prime is 129491233. The next prime is 129491267. The reversal of 129491265 is 562194921.

It is not a de Polignac number, because 129491265 - 2⁵ = 129491233 is a prime.

It is a super-2 number, since 2×129491265² = 33535975422600450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129491267) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225 + ... + 16094.

It is an arithmetic number, because the mean of its divisors is an integer number (9024960).

Almost surely, 2^129491265 is an apocalyptic number.

129491265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129491265 is a deficient number, since it is larger than the sum of its proper divisors (87107775).

129491265 is a wasteful number, since it uses less digits than its factorization.

129491265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16373 (or 16350 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 129491265 is about 11379.4228764028. The cubic root of 129491265 is about 505.9180307993.

The spelling of 129491265 in words is "one hundred twenty-nine million, four hundred ninety-one thousand, two hundred sixty-five".