1216971 has 32 divisors (see below), whose sum is σ = 2119680. Its totient is φ = 675648.

The previous prime is 1216961. The next prime is 1216973. The reversal of 1216971 is 1796121.

1216971 = 64² + 65² + ... + 157².

It is not a de Polignac number, because 1216971 - 2⁵ = 1216939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1216973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8815 + ... + 8951.

It is an arithmetic number, because the mean of its divisors is an integer number (66240).

2^1216971 is an apocalyptic number.

1216971 is a deficient number, since it is larger than the sum of its proper divisors (902709).

1216971 is a wasteful number, since it uses less digits than its factorization.

1216971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 194 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 1216971 is about 1103.1640857098. The cubic root of 1216971 is about 106.7644686753.

It can be divided in two parts, 1216 and 971, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1216971 in words is "one million, two hundred sixteen thousand, nine hundred seventy-one".