1611216817 has 4 divisors (see below), whose sum is σ = 1841390656. Its totient is φ = 1381042980.

The previous prime is 1611216793. The next prime is 1611216947. The reversal of 1611216817 is 7186121161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1611216817 - 2¹¹ = 1611214769 is a prime.

It is a super-2 number, since 2×1611216817² = 5192039262767222978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1611216317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115086909 + ... + 115086922.

It is an arithmetic number, because the mean of its divisors is an integer number (460347664).

Almost surely, 2^1611216817 is an apocalyptic number.

It is an amenable number.

1611216817 is a deficient number, since it is larger than the sum of its proper divisors (230173839).

1611216817 is an equidigital number, since it uses as much as digits as its factorization.

1611216817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230173838.

The product of its digits is 4032, while the sum is 34.

The square root of 1611216817 is about 40139.9653338166. The cubic root of 1611216817 is about 1172.3339140365. Note that the first 3 decimals are identical.

Adding to 1611216817 its reverse (7186121161), we get a palindrome (8797337978).

The spelling of 1611216817 in words is "one billion, six hundred eleven million, two hundred sixteen thousand, eight hundred seventeen".