1320377609 has 2 divisors, whose sum is σ = 1320377610. Its totient is φ = 1320377608.

The previous prime is 1320377549. The next prime is 1320377647. The reversal of 1320377609 is 9067730231.

It is an a-pointer prime, because the next prime (1320377647) can be obtained adding 1320377609 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 953080384 + 367297225 = 30872^2 + 19165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320377609 - 2¹⁶ = 1320312073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320377209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660188804 + 660188805.

It is an arithmetic number, because the mean of its divisors is an integer number (660188805).

Almost surely, 2^1320377609 is an apocalyptic number.

It is an amenable number.

1320377609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320377609 is an equidigital number, since it uses as much as digits as its factorization.

1320377609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 38.

The square root of 1320377609 is about 36337.0005504032. Note that the first 3 decimals coincide. The cubic root of 1320377609 is about 1097.0659021459.

The spelling of 1320377609 in words is "one billion, three hundred twenty million, three hundred seventy-seven thousand, six hundred nine".