1646321311 has 16 divisors (see below), whose sum is σ = 1709585280. Its totient is φ = 1585178400.

The previous prime is 1646321279. The next prime is 1646321321. The reversal of 1646321311 is 1131236461.

It is not a de Polignac number, because 1646321311 - 2⁵ = 1646321279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1646321311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646321321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10486045 + ... + 10486201.

It is an arithmetic number, because the mean of its divisors is an integer number (106849080).

Almost surely, 2^1646321311 is an apocalyptic number.

1646321311 is a deficient number, since it is larger than the sum of its proper divisors (63263969).

1646321311 is an frugal number, since it uses more digits than its factorization.

1646321311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 305 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 1646321311 is about 40574.8852247298. The cubic root of 1646321311 is about 1180.7869190839.

Adding to 1646321311 its reverse (1131236461), we get a palindrome (2777557772).

The spelling of 1646321311 in words is "one billion, six hundred forty-six million, three hundred twenty-one thousand, three hundred eleven".