1320781625 has 8 divisors (see below), whose sum is σ = 1648335624. Its totient is φ = 1056625200.

The previous prime is 1320781621. The next prime is 1320781681. The reversal of 1320781625 is 5261870231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 366033424 + 954748201 = 19132^2 + 30899^2 .

It is not a de Polignac number, because 1320781625 - 2² = 1320781621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320781621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5283002 + ... + 5283251.

It is an arithmetic number, because the mean of its divisors is an integer number (206041953).

Almost surely, 2^1320781625 is an apocalyptic number.

It is an amenable number.

1320781625 is a deficient number, since it is larger than the sum of its proper divisors (327553999).

1320781625 is an equidigital number, since it uses as much as digits as its factorization.

1320781625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10566268 (or 10566258 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1320781625 is about 36342.5594173003. The cubic root of 1320781625 is about 1097.1777860431.

The spelling of 1320781625 in words is "one billion, three hundred twenty million, seven hundred eighty-one thousand, six hundred twenty-five".