129360861 has 32 divisors (see below), whose sum is σ = 226099200. Its totient is φ = 71532720.

The previous prime is 129360859. The next prime is 129360919. The reversal of 129360861 is 168063921.

It is not a de Polignac number, because 129360861 - 2¹ = 129360859 is a prime.

It is a super-2 number, since 2×129360861² = 33468464717322642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129360821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5181 + ... + 16898.

It is an arithmetic number, because the mean of its divisors is an integer number (7065600).

Almost surely, 2^129360861 is an apocalyptic number.

It is an amenable number.

129360861 is a deficient number, since it is larger than the sum of its proper divisors (96738339).

129360861 is a wasteful number, since it uses less digits than its factorization.

129360861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22126 (or 22120 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 129360861 is about 11373.6916170608. The cubic root of 129360861 is about 505.7481457404.

The spelling of 129360861 in words is "one hundred twenty-nine million, three hundred sixty thousand, eight hundred sixty-one".