172812533 has 4 divisors (see below), whose sum is σ = 177483180. Its totient is φ = 168141888.

The previous prime is 172812529. The next prime is 172812539. The reversal of 172812533 is 335218271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 335218271 = 5813 ⋅57667.

It can be written as a sum of positive squares in 2 ways, for example, as 79245604 + 93566929 = 8902^2 + 9673^2 .

It is a cyclic number.

It is not a de Polignac number, because 172812533 - 2² = 172812529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172812533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172812539) 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, 2335268 + ... + 2335341.

It is an arithmetic number, because the mean of its divisors is an integer number (44370795).

Almost surely, 2^172812533 is an apocalyptic number.

It is an amenable number.

172812533 is a deficient number, since it is larger than the sum of its proper divisors (4670647).

172812533 is an equidigital number, since it uses as much as digits as its factorization.

172812533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670646.

The product of its digits is 10080, while the sum is 32.

The square root of 172812533 is about 13145.8180802870. The cubic root of 172812533 is about 557.0041256878.

The spelling of 172812533 in words is "one hundred seventy-two million, eight hundred twelve thousand, five hundred thirty-three".