129871245 has 64 divisors (see below), whose sum is σ = 259670016. Its totient is φ = 54051840.

The previous prime is 129871219. The next prime is 129871277. The reversal of 129871245 is 542178921.

It is not a de Polignac number, because 129871245 - 2¹⁸ = 129609101 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54162 + ... + 56508.

It is an arithmetic number, because the mean of its divisors is an integer number (4057344).

Almost surely, 2^129871245 is an apocalyptic number.

129871245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129871245 is a deficient number, since it is larger than the sum of its proper divisors (129798771).

129871245 is a wasteful number, since it uses less digits than its factorization.

129871245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410.

The product of its digits is 40320, while the sum is 39.

The square root of 129871245 is about 11396.1065719833. The cubic root of 129871245 is about 506.4124039236.

The spelling of 129871245 in words is "one hundred twenty-nine million, eight hundred seventy-one thousand, two hundred forty-five".