215132317 has 4 divisors (see below), whose sum is σ = 224485920. Its totient is φ = 205778716.

The previous prime is 215132303. The next prime is 215132339. The reversal of 215132317 is 713231512.

It is a happy number.

215132317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-215132317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215132291 and 215132300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215132017) 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, 4676767 + ... + 4676812.

It is an arithmetic number, because the mean of its divisors is an integer number (56121480).

Almost surely, 2^215132317 is an apocalyptic number.

It is an amenable number.

215132317 is a deficient number, since it is larger than the sum of its proper divisors (9353603).

215132317 is an equidigital number, since it uses as much as digits as its factorization.

215132317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9353602.

The product of its digits is 1260, while the sum is 25.

The square root of 215132317 is about 14667.3895768811. The cubic root of 215132317 is about 599.1955116277.

Adding to 215132317 its reverse (713231512), we get a palindrome (928363829).

The spelling of 215132317 in words is "two hundred fifteen million, one hundred thirty-two thousand, three hundred seventeen".