217149601 has 4 divisors (see below), whose sum is σ = 226590912. Its totient is φ = 207708292.

The previous prime is 217149577. The next prime is 217149607. The reversal of 217149601 is 106941712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 217149601 - 2¹⁹ = 216625313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217149607) 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 3 ways as a sum of consecutive naturals, for example, 4720621 + ... + 4720666.

It is an arithmetic number, because the mean of its divisors is an integer number (56647728).

Almost surely, 2^217149601 is an apocalyptic number.

It is an amenable number.

217149601 is a deficient number, since it is larger than the sum of its proper divisors (9441311).

217149601 is an equidigital number, since it uses as much as digits as its factorization.

217149601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9441310.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 217149601 is about 14735.9967766012. The cubic root of 217149601 is about 601.0625625277.

The spelling of 217149601 in words is "two hundred seventeen million, one hundred forty-nine thousand, six hundred one".