1379125009 has 2 divisors, whose sum is σ = 1379125010. Its totient is φ = 1379125008.

The previous prime is 1379125001. The next prime is 1379125039. The reversal of 1379125009 is 9005219731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359544384 + 19580625 = 36872^2 + 4425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379125009 - 2³ = 1379125001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1379125001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689562504 + 689562505.

It is an arithmetic number, because the mean of its divisors is an integer number (689562505).

Almost surely, 2^1379125009 is an apocalyptic number.

It is an amenable number.

1379125009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379125009 is an equidigital number, since it uses as much as digits as its factorization.

1379125009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 1379125009 is about 37136.5723916465. The cubic root of 1379125009 is about 1113.1009276108.

The spelling of 1379125009 in words is "one billion, three hundred seventy-nine million, one hundred twenty-five thousand, nine".