1251216 has 30 divisors (see below), whose sum is σ = 3502070. Its totient is φ = 417024.

The previous prime is 1251179. The next prime is 1251227. The reversal of 1251216 is 6121521.

It can be written as a sum of positive squares in only one way, i.e., 1218816 + 32400 = 1104^2 + 180^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4201 + ... + 4488.

2^1251216 is an apocalyptic number.

1251216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1251216 is an abundant number, since it is smaller than the sum of its proper divisors (2250854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251216 is a wasteful number, since it uses less digits than its factorization.

1251216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8703 (or 8694 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 1251216 is about 1118.5776682913. The cubic root of 1251216 is about 107.7566537487.

Adding to 1251216 its reverse (6121521), we get a palindrome (7372737).

The spelling of 1251216 in words is "one million, two hundred fifty-one thousand, two hundred sixteen".