1379356009 has 2 divisors, whose sum is σ = 1379356010. Its totient is φ = 1379356008.

The previous prime is 1379356007. The next prime is 1379356057. The reversal of 1379356009 is 9006539731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1131986025 + 247369984 = 33645^2 + 15728^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379356009 - 2¹ = 1379356007 is a prime.

Together with 1379356007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1379356003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689678004 + 689678005.

It is an arithmetic number, because the mean of its divisors is an integer number (689678005).

Almost surely, 2^1379356009 is an apocalyptic number.

It is an amenable number.

1379356009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379356009 is an equidigital number, since it uses as much as digits as its factorization.

1379356009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 43.

The square root of 1379356009 is about 37139.6824030578. The cubic root of 1379356009 is about 1113.1630713512.

The spelling of 1379356009 in words is "one billion, three hundred seventy-nine million, three hundred fifty-six thousand, nine".