129918525 has 24 divisors (see below), whose sum is σ = 234327264. Its totient is φ = 62990400.

The previous prime is 129918499. The next prime is 129918533. The reversal of 129918525 is 525819921.

It is not a de Polignac number, because 129918525 - 2¹⁴ = 129902141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77914 + ... + 79563.

It is an arithmetic number, because the mean of its divisors is an integer number (9763636).

Almost surely, 2^129918525 is an apocalyptic number.

129918525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129918525 is a deficient number, since it is larger than the sum of its proper divisors (104408739).

129918525 is a wasteful number, since it uses less digits than its factorization.

129918525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157501 (or 157496 counting only the distinct ones).

The product of its digits is 64800, while the sum is 42.

The square root of 129918525 is about 11398.1807758958. The cubic root of 129918525 is about 506.4738500981.

The spelling of 129918525 in words is "one hundred twenty-nine million, nine hundred eighteen thousand, five hundred twenty-five".