1325815009 has 2 divisors, whose sum is σ = 1325815010. Its totient is φ = 1325815008.

The previous prime is 1325814979. The next prime is 1325815061. The reversal of 1325815009 is 9005185231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1169640000 + 156175009 = 34200^2 + 12497^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325815009 - 2¹³ = 1325806817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1325813009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662907504 + 662907505.

It is an arithmetic number, because the mean of its divisors is an integer number (662907505).

Almost surely, 2^1325815009 is an apocalyptic number.

It is an amenable number.

1325815009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325815009 is an equidigital number, since it uses as much as digits as its factorization.

1325815009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 1325815009 is about 36411.7427350024. The cubic root of 1325815009 is about 1098.5697690291.

The spelling of 1325815009 in words is "one billion, three hundred twenty-five million, eight hundred fifteen thousand, nine".