1345178209 has 2 divisors, whose sum is σ = 1345178210. Its totient is φ = 1345178208.

The previous prime is 1345178189. The next prime is 1345178221. The reversal of 1345178209 is 9028715431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 919787584 + 425390625 = 30328^2 + 20625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345178209 - 2²¹ = 1343081057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1345178239) 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, 672589104 + 672589105.

It is an arithmetic number, because the mean of its divisors is an integer number (672589105).

Almost surely, 2^1345178209 is an apocalyptic number.

It is an amenable number.

1345178209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345178209 is an equidigital number, since it uses as much as digits as its factorization.

1345178209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1345178209 is about 36676.6711821016. The cubic root of 1345178209 is about 1103.8920554620.

The spelling of 1345178209 in words is "one billion, three hundred forty-five million, one hundred seventy-eight thousand, two hundred nine".