1216613 has 4 divisors (see below), whose sum is σ = 1218828. Its totient is φ = 1214400.

The previous prime is 1216603. The next prime is 1216619. The reversal of 1216613 is 3166121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2209 + 1214404 = 47^2 + 1102^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216613 - 2¹² = 1212517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (304707).

2^1216613 is an apocalyptic number.

It is an amenable number.

1216613 is a deficient number, since it is larger than the sum of its proper divisors (2215).

1216613 is a wasteful number, since it uses less digits than its factorization.

1216613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214.

The product of its digits is 216, while the sum is 20.

The square root of 1216613 is about 1103.0018132351. The cubic root of 1216613 is about 106.7539985741.

The spelling of 1216613 in words is "one million, two hundred sixteen thousand, six hundred thirteen".