45217 has 4 divisors (see below), whose sum is σ = 45760. Its totient is φ = 44676.

The previous prime is 45197. The next prime is 45233. The reversal of 45217 is 71254.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45217 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 45194 and 45203.

It is not an unprimeable number, because it can be changed into a prime (45247) 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, 117 + ... + 322.

It is an arithmetic number, because the mean of its divisors is an integer number (11440).

2⁴⁵²¹⁷ is an apocalyptic number.

It is an amenable number.

45217 is a deficient number, since it is larger than the sum of its proper divisors (543).

45217 is a wasteful number, since it uses less digits than its factorization.

45217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542.

The product of its digits is 280, while the sum is 19.

The square root of 45217 is about 212.6428931331. The cubic root of 45217 is about 35.6260151552.

It can be divided in two parts, 45 and 217, that added together give a palindrome (262).

The spelling of 45217 in words is "forty-five thousand, two hundred seventeen".