1616321331 has 16 divisors (see below), whose sum is σ = 2433807520. Its totient is φ = 1059881760.

The previous prime is 1616321321. The next prime is 1616321381. The reversal of 1616321331 is 1331236161.

1616321331 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 321 + 331 = 666.

It is not a de Polignac number, because 1616321331 - 2⁵ = 1616321299 is a prime.

It is a super-2 number, since 2×1616321331² = 5224989290091223122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1616321295 and 1616321304.

It is not an unprimeable number, because it can be changed into a prime (1616321321) 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, 489040 + ... + 492333.

It is an arithmetic number, because the mean of its divisors is an integer number (152112970).

Almost surely, 2^1616321331 is an apocalyptic number.

1616321331 is a deficient number, since it is larger than the sum of its proper divisors (817486189).

1616321331 is an equidigital number, since it uses as much as digits as its factorization.

1616321331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981443 (or 981437 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 1616321331 is about 40203.4989895158. The cubic root of 1616321331 is about 1173.5706369864.

Adding to 1616321331 its reverse (1331236161), we get a palindrome (2947557492).

The spelling of 1616321331 in words is "one billion, six hundred sixteen million, three hundred twenty-one thousand, three hundred thirty-one".