1381458209 has 2 divisors, whose sum is σ = 1381458210. Its totient is φ = 1381458208.

The previous prime is 1381458191. The next prime is 1381458241. The reversal of 1381458209 is 9028541831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1230045184 + 151413025 = 35072^2 + 12305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381458209 - 2²⁸ = 1113022753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1381451209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690729104 + 690729105.

It is an arithmetic number, because the mean of its divisors is an integer number (690729105).

Almost surely, 2^1381458209 is an apocalyptic number.

It is an amenable number.

1381458209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381458209 is an equidigital number, since it uses as much as digits as its factorization.

1381458209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 1381458209 is about 37167.9728933392. The cubic root of 1381458209 is about 1113.7282876787.

The spelling of 1381458209 in words is "one billion, three hundred eighty-one million, four hundred fifty-eight thousand, two hundred nine".