1616524321 has 2 divisors, whose sum is σ = 1616524322. Its totient is φ = 1616524320.

The previous prime is 1616524319. The next prime is 1616524331. The reversal of 1616524321 is 1234256161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1329696225 + 286828096 = 36465^2 + 16936^2 .

It is an emirp because it is prime and its reverse (1234256161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1616524321 - 2¹ = 1616524319 is a prime.

It is a super-2 number, since 2×1616524321² = 5226301760769022082, which contains 22 as substring.

Together with 1616524319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1616524331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808262160 + 808262161.

It is an arithmetic number, because the mean of its divisors is an integer number (808262161).

Almost surely, 2^1616524321 is an apocalyptic number.

It is an amenable number.

1616524321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616524321 is an equidigital number, since it uses as much as digits as its factorization.

1616524321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 1616524321 is about 40206.0234417680. The cubic root of 1616524321 is about 1173.6197635900.

The spelling of 1616524321 in words is "one billion, six hundred sixteen million, five hundred twenty-four thousand, three hundred twenty-one".