172443561 has 8 divisors (see below), whose sum is σ = 229987104. Its totient is φ = 114931200.

The previous prime is 172443547. The next prime is 172443571. The reversal of 172443561 is 165344271.

172443561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 172443561 - 2⁶ = 172443497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172443571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13161 + ... + 22761.

It is an arithmetic number, because the mean of its divisors is an integer number (28748388).

Almost surely, 2^172443561 is an apocalyptic number.

It is an amenable number.

172443561 is a deficient number, since it is larger than the sum of its proper divisors (57543543).

172443561 is an equidigital number, since it uses as much as digits as its factorization.

172443561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15591.

The product of its digits is 20160, while the sum is 33.

The square root of 172443561 is about 13131.7767647794. The cubic root of 172443561 is about 556.6074234266.

The spelling of 172443561 in words is "one hundred seventy-two million, four hundred forty-three thousand, five hundred sixty-one".