217074145 has 16 divisors (see below), whose sum is σ = 274968000. Its totient is φ = 164058048.

The previous prime is 217074119. The next prime is 217074197. The reversal of 217074145 is 541470712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217074145 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32991 + ... + 39019.

It is an arithmetic number, because the mean of its divisors is an integer number (17185500).

Almost surely, 2^217074145 is an apocalyptic number.

It is an amenable number.

217074145 is a deficient number, since it is larger than the sum of its proper divisors (57893855).

217074145 is a wasteful number, since it uses less digits than its factorization.

217074145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 217074145 is about 14733.4362930037. The cubic root of 217074145 is about 600.9929345987.

It can be divided in two parts, 21707 and 4145, that added together give a palindrome (25852).

The spelling of 217074145 in words is "two hundred seventeen million, seventy-four thousand, one hundred forty-five".