172161992 has 48 divisors (see below), whose sum is σ = 357448140. Its totient is φ = 77462528.

The previous prime is 172161991. The next prime is 172162019. The reversal of 172161992 is 299161271.

172161992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 167081476 + 5080516 = 12926^2 + 2254^2 .

It is not an unprimeable number, because it can be changed into a prime (172161991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70748 + ... + 73140.

Almost surely, 2^172161992 is an apocalyptic number.

It is an amenable number.

172161992 is an abundant number, since it is smaller than the sum of its proper divisors (185286148).

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

172161992 is a wasteful number, since it uses less digits than its factorization.

172161992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462 (or 2435 counting only the distinct ones).

The product of its digits is 13608, while the sum is 38.

The square root of 172161992 is about 13121.0514822555. The cubic root of 172161992 is about 556.3043121315.

The spelling of 172161992 in words is "one hundred seventy-two million, one hundred sixty-one thousand, nine hundred ninety-two".