172129012 has 48 divisors (see below), whose sum is σ = 349453440. Its totient is φ = 73318400.

The previous prime is 172128989. The next prime is 172129031. The reversal of 172129012 is 210921271.

172129012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×172129012² = 59256793544192288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268212 + ... + 268852.

It is an arithmetic number, because the mean of its divisors is an integer number (7280280).

Almost surely, 2^172129012 is an apocalyptic number.

It is an amenable number.

172129012 is an abundant number, since it is smaller than the sum of its proper divisors (177324428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172129012 is a wasteful number, since it uses less digits than its factorization.

172129012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 172129012 is about 13119.7946630273. The cubic root of 172129012 is about 556.2687872794.

The spelling of 172129012 in words is "one hundred seventy-two million, one hundred twenty-nine thousand, twelve".