1216513 has 8 divisors (see below), whose sum is σ = 1311200. Its totient is φ = 1124928.

The previous prime is 1216507. The next prime is 1216529. The reversal of 1216513 is 3156121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (163900).

It is a Proth number, since it is equal to 297 ⋅ 2¹² + 1 and 297 < 2¹².

2^1216513 is an apocalyptic number.

It is an amenable number.

1216513 is a deficient number, since it is larger than the sum of its proper divisors (94687).

1216513 is a wasteful number, since it uses less digits than its factorization.

1216513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551.

The product of its digits is 180, while the sum is 19.

The square root of 1216513 is about 1102.9564814624. The cubic root of 1216513 is about 106.7510735979.

The spelling of 1216513 in words is "one million, two hundred sixteen thousand, five hundred thirteen".