971218 has 4 divisors (see below), whose sum is σ = 1456830. Its totient is φ = 485608.

The previous prime is 971207. The next prime is 971237. The reversal of 971218 is 812179.

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

It can be written as a sum of positive squares in only one way, i.e., 660969 + 310249 = 813^2 + 557^2 .

It is an unprimeable number.

971218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 242803 + ... + 242806.

2⁹⁷¹²¹⁸ is an apocalyptic number.

971218 is a deficient number, since it is larger than the sum of its proper divisors (485612).

971218 is a wasteful number, since it uses less digits than its factorization.

971218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485611.

The product of its digits is 1008, while the sum is 28.

The square root of 971218 is about 985.5039320064. The cubic root of 971218 is about 99.0312454516.

It can be divided in two parts, 9712 and 18, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 971218 in words is "nine hundred seventy-one thousand, two hundred eighteen".