172734521 has 2 divisors, whose sum is σ = 172734522. Its totient is φ = 172734520.

The previous prime is 172734481. The next prime is 172734539. The reversal of 172734521 is 125437271.

172734521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147282496 + 25452025 = 12136^2 + 5045^2 .

It is a cyclic number.

It is not a de Polignac number, because 172734521 - 2¹⁰ = 172733497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172764521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86367260 + 86367261.

It is an arithmetic number, because the mean of its divisors is an integer number (86367261).

Almost surely, 2^172734521 is an apocalyptic number.

It is an amenable number.

172734521 is a deficient number, since it is larger than the sum of its proper divisors (1).

172734521 is an equidigital number, since it uses as much as digits as its factorization.

172734521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 32.

The square root of 172734521 is about 13142.8505659921. The cubic root of 172734521 is about 556.9202977668.

The spelling of 172734521 in words is "one hundred seventy-two million, seven hundred thirty-four thousand, five hundred twenty-one".