1001216 has 18 divisors (see below), whose sum is σ = 1999032. Its totient is φ = 500480.

The previous prime is 1001197. The next prime is 1001219. The reversal of 1001216 is 6121001.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 1001197 and 1001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1700 + ... + 2211.

2^1001216 is an apocalyptic number.

1001216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1001216 is a deficient number, since it is larger than the sum of its proper divisors (997816).

1001216 is an frugal number, since it uses more digits than its factorization.

1001216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927 (or 3913 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1001216 is about 1000.6078152803. The cubic root of 1001216 is about 100.0405169149.

Adding to 1001216 its reverse (6121001), we get a palindrome (7122217).

The spelling of 1001216 in words is "one million, one thousand, two hundred sixteen".