172420543 has 4 divisors (see below), whose sum is σ = 177982528. Its totient is φ = 166858560.

The previous prime is 172420541. The next prime is 172420553. The reversal of 172420543 is 345024271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172420543 - 2¹ = 172420541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172420541) 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, 2780946 + ... + 2781007.

It is an arithmetic number, because the mean of its divisors is an integer number (44495632).

Almost surely, 2^172420543 is an apocalyptic number.

172420543 is a deficient number, since it is larger than the sum of its proper divisors (5561985).

172420543 is an equidigital number, since it uses as much as digits as its factorization.

172420543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561984.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 172420543 is about 13130.9003118598. The cubic root of 172420543 is about 556.5826567538.

The spelling of 172420543 in words is "one hundred seventy-two million, four hundred twenty thousand, five hundred forty-three".