172109249140 has 12 divisors (see below), whose sum is σ = 361429423236. Its totient is φ = 68843699648.

The previous prime is 172109249023. The next prime is 172109249141. The reversal of 172109249140 is 41942901271.

It can be written as a sum of positive squares in 2 ways, for example, as 63437489424 + 108671759716 = 251868^2 + 329654^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172109249093 and 172109249102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172109249141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4302731209 + ... + 4302731248.

It is an arithmetic number, because the mean of its divisors is an integer number (30119118603).

Almost surely, 2^172109249140 is an apocalyptic number.

172109249140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172109249140 is an abundant number, since it is smaller than the sum of its proper divisors (189320174096).

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

172109249140 is a wasteful number, since it uses less digits than its factorization.

172109249140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8605462466 (or 8605462464 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 172109249140 in words is "one hundred seventy-two billion, one hundred nine million, two hundred forty-nine thousand, one hundred forty".