2015552321 has 2 divisors, whose sum is σ = 2015552322. Its totient is φ = 2015552320.

The previous prime is 2015552303. The next prime is 2015552323. The reversal of 2015552321 is 1232555102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1932833296 + 82719025 = 43964^2 + 9095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2015552321 is a prime.

Together with 2015552323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2015552323) 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 as a sum of consecutive naturals, namely, 1007776160 + 1007776161.

It is an arithmetic number, because the mean of its divisors is an integer number (1007776161).

Almost surely, 2^2015552321 is an apocalyptic number.

It is an amenable number.

2015552321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015552321 is an equidigital number, since it uses as much as digits as its factorization.

2015552321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 2015552321 is about 44894.9030625972. The cubic root of 2015552321 is about 1263.1784039597.

The spelling of 2015552321 in words is "two billion, fifteen million, five hundred fifty-two thousand, three hundred twenty-one".