172231556 has 48 divisors (see below), whose sum is σ = 371661696. Its totient is φ = 68150784.

The previous prime is 172231541. The next prime is 172231583. The reversal of 172231556 is 655132271.

It is a super-2 number, since 2×172231556² = 59327417764362272, which contains 22 as substring.

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, 21815 + ... + 28641.

It is an arithmetic number, because the mean of its divisors is an integer number (7742952).

Almost surely, 2^172231556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172231556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185830848).

172231556 is an abundant number, since it is smaller than the sum of its proper divisors (199430140).

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

172231556 is a wasteful number, since it uses less digits than its factorization.

172231556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6908 (or 6906 counting only the distinct ones).

The product of its digits is 12600, while the sum is 32.

The square root of 172231556 is about 13123.7020691572. The cubic root of 172231556 is about 556.3792290584.

The spelling of 172231556 in words is "one hundred seventy-two million, two hundred thirty-one thousand, five hundred fifty-six".