172542449 has 2 divisors, whose sum is σ = 172542450. Its totient is φ = 172542448.

The previous prime is 172542437. The next prime is 172542451. The reversal of 172542449 is 944245271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172449424 + 93025 = 13132^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 172542449 - 2²⁰ = 171493873 is a prime.

It is a Sophie Germain prime.

Together with 172542451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172512449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86271224 + 86271225.

It is an arithmetic number, because the mean of its divisors is an integer number (86271225).

Almost surely, 2^172542449 is an apocalyptic number.

It is an amenable number.

172542449 is a deficient number, since it is larger than the sum of its proper divisors (1).

172542449 is an equidigital number, since it uses as much as digits as its factorization.

172542449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 38.

The square root of 172542449 is about 13135.5414429707. The cubic root of 172542449 is about 556.7137988626.

The spelling of 172542449 in words is "one hundred seventy-two million, five hundred forty-two thousand, four hundred forty-nine".