129171916 has 48 divisors (see below), whose sum is σ = 255709440. Its totient is φ = 56770560.

The previous prime is 129171869. The next prime is 129171923. The reversal of 129171916 is 619171921.

It is a super-2 number, since 2×129171916² = 33370767766222112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60076 + ... + 62188.

It is an arithmetic number, because the mean of its divisors is an integer number (5327280).

Almost surely, 2^129171916 is an apocalyptic number.

It is an amenable number.

129171916 is a deficient number, since it is larger than the sum of its proper divisors (126537524).

129171916 is a wasteful number, since it uses less digits than its factorization.

129171916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194 (or 2192 counting only the distinct ones).

The product of its digits is 6804, while the sum is 37.

The square root of 129171916 is about 11365.3823516853. The cubic root of 129171916 is about 505.5017931603.

The spelling of 129171916 in words is "one hundred twenty-nine million, one hundred seventy-one thousand, nine hundred sixteen".