172011543 has 12 divisors (see below), whose sum is σ = 252094584. Its totient is φ = 104249200.

The previous prime is 172011533. The next prime is 172011569. The reversal of 172011543 is 345110271.

It is not a de Polignac number, because 172011543 - 2¹² = 172007447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172011533) 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, 236568 + ... + 237293.

It is an arithmetic number, because the mean of its divisors is an integer number (21007882).

Almost surely, 2^172011543 is an apocalyptic number.

172011543 is a deficient number, since it is larger than the sum of its proper divisors (80083041).

172011543 is a wasteful number, since it uses less digits than its factorization.

172011543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473886 (or 473875 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 172011543 is about 13115.3171139702. The cubic root of 172011543 is about 556.1422170832.

The spelling of 172011543 in words is "one hundred seventy-two million, eleven thousand, five hundred forty-three".