172216745 has 8 divisors (see below), whose sum is σ = 206836416. Its totient is φ = 137655856.

The previous prime is 172216739. The next prime is 172216747. The reversal of 172216745 is 547612271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172216745 - 2⁸ = 172216489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172216747) 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 in 7 ways as a sum of consecutive naturals, for example, 7967 + ... + 20196.

It is an arithmetic number, because the mean of its divisors is an integer number (25854552).

Almost surely, 2^172216745 is an apocalyptic number.

It is an amenable number.

172216745 is a deficient number, since it is larger than the sum of its proper divisors (34619671).

172216745 is a wasteful number, since it uses less digits than its factorization.

172216745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29391.

The product of its digits is 23520, while the sum is 35.

The square root of 172216745 is about 13123.1377726518. The cubic root of 172216745 is about 556.3632800473.

The spelling of 172216745 in words is "one hundred seventy-two million, two hundred sixteen thousand, seven hundred forty-five".