217016953 has 4 divisors (see below), whose sum is σ = 220256080. Its totient is φ = 213777828.

The previous prime is 217016939. The next prime is 217016971. The reversal of 217016953 is 359610712.

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 a de Polignac number, because none of the positive numbers 2^k-217016953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217016903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619463 + ... + 1619596.

It is an arithmetic number, because the mean of its divisors is an integer number (55064020).

Almost surely, 2^217016953 is an apocalyptic number.

It is an amenable number.

217016953 is a deficient number, since it is larger than the sum of its proper divisors (3239127).

217016953 is an equidigital number, since it uses as much as digits as its factorization.

217016953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239126.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 217016953 is about 14731.4952737324. The cubic root of 217016953 is about 600.9401492444.

The spelling of 217016953 in words is "two hundred seventeen million, sixteen thousand, nine hundred fifty-three".