1612821305 has 16 divisors (see below), whose sum is σ = 2036183184. Its totient is φ = 1224760320.

The previous prime is 1612821293. The next prime is 1612821319. The reversal of 1612821305 is 5031282161.

It can be written as a sum of positive squares in 8 ways, for example, as 316969 + 1612504336 = 563^2 + 40156^2 .

It is not a de Polignac number, because 1612821305 - 2¹⁰ = 1612820281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 98732 + ... + 113901.

It is an arithmetic number, because the mean of its divisors is an integer number (127261449).

Almost surely, 2^1612821305 is an apocalyptic number.

It is an amenable number.

1612821305 is a deficient number, since it is larger than the sum of its proper divisors (423361879).

1612821305 is a wasteful number, since it uses less digits than its factorization.

1612821305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212716.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1612821305 is about 40159.9465263588. The cubic root of 1612821305 is about 1172.7229309258.

The spelling of 1612821305 in words is "one billion, six hundred twelve million, eight hundred twenty-one thousand, three hundred five".