217150117 has 4 divisors (see below), whose sum is σ = 219388876. Its totient is φ = 214911360.

The previous prime is 217150111. The next prime is 217150139. The reversal of 217150117 is 711051712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133957476 + 83192641 = 11574^2 + 9121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217150117 is a prime.

It is a super-2 number, since 2×217150117² = 94308346626227378, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217150091 and 217150100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217150111) 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, 1119234 + ... + 1119427.

It is an arithmetic number, because the mean of its divisors is an integer number (54847219).

Almost surely, 2^217150117 is an apocalyptic number.

It is an amenable number.

217150117 is a deficient number, since it is larger than the sum of its proper divisors (2238759).

217150117 is an equidigital number, since it uses as much as digits as its factorization.

217150117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238758.

The product of its (nonzero) digits is 490, while the sum is 25.

The square root of 217150117 is about 14736.0142847379. The cubic root of 217150117 is about 601.0630386173.

The spelling of 217150117 in words is "two hundred seventeen million, one hundred fifty thousand, one hundred seventeen".