172054009 has 2 divisors, whose sum is σ = 172054010. Its totient is φ = 172054008.

The previous prime is 172053989. The next prime is 172054019. The reversal of 172054009 is 900450271.

It is a happy number.

172054009 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., 146773225 + 25280784 = 12115^2 + 5028^2 .

It is a cyclic number.

It is not a de Polignac number, because 172054009 - 2²⁵ = 138499577 is a prime.

It is a Chen prime.

It is equal to p_9611533 and since 172054009 and 9611533 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (172054019) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86027004 + 86027005.

It is an arithmetic number, because the mean of its divisors is an integer number (86027005).

Almost surely, 2^172054009 is an apocalyptic number.

It is an amenable number.

172054009 is a deficient number, since it is larger than the sum of its proper divisors (1).

172054009 is an equidigital number, since it uses as much as digits as its factorization.

172054009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 172054009 is about 13116.9359608104. The cubic root of 172054009 is about 556.1879798882.

It can be divided in two parts, 1 and 72054009, that added together give a triangular number (72054010 = T₁₂₀₀₄).

The spelling of 172054009 in words is "one hundred seventy-two million, fifty-four thousand, nine".