1216625 has 8 divisors (see below), whose sum is σ = 1518504. Its totient is φ = 973200.

The previous prime is 1216619. The next prime is 1216681. The reversal of 1216625 is 5266121.

It can be written as a sum of positive squares in 4 ways, for example, as 16 + 1216609 = 4^2 + 1103^2 .

It is not a de Polignac number, because 1216625 - 2⁶ = 1216561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216625.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4742 + ... + 4991.

It is an arithmetic number, because the mean of its divisors is an integer number (189813).

2^1216625 is an apocalyptic number.

It is an amenable number.

1216625 is a deficient number, since it is larger than the sum of its proper divisors (301879).

1216625 is an frugal number, since it uses more digits than its factorization.

1216625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9748 (or 9738 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 1216625 is about 1103.0072529227. The cubic root of 1216625 is about 106.7543495605.

The spelling of 1216625 in words is "one million, two hundred sixteen thousand, six hundred twenty-five".