1616261329 has 2 divisors, whose sum is σ = 1616261330. Its totient is φ = 1616261328.

The previous prime is 1616261327. The next prime is 1616261357. The reversal of 1616261329 is 9231626161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1014295104 + 601966225 = 31848^2 + 24535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616261329 - 2¹ = 1616261327 is a prime.

It is a super-2 number, since 2×1616261329² = 5224601367241692482, which contains 22 as substring.

Together with 1616261327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1616261327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808130664 + 808130665.

It is an arithmetic number, because the mean of its divisors is an integer number (808130665).

Almost surely, 2^1616261329 is an apocalyptic number.

It is an amenable number.

1616261329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616261329 is an equidigital number, since it uses as much as digits as its factorization.

1616261329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 1616261329 is about 40202.7527540093. The cubic root of 1616261329 is about 1173.5561148211.

The spelling of 1616261329 in words is "one billion, six hundred sixteen million, two hundred sixty-one thousand, three hundred twenty-nine".