1378197241 has 2 divisors, whose sum is σ = 1378197242. Its totient is φ = 1378197240.

The previous prime is 1378197239. The next prime is 1378197253. The reversal of 1378197241 is 1427918731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1347991225 + 30206016 = 36715^2 + 5496^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378197241 - 2¹ = 1378197239 is a prime.

Together with 1378197239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1378197211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689098620 + 689098621.

It is an arithmetic number, because the mean of its divisors is an integer number (689098621).

Almost surely, 2^1378197241 is an apocalyptic number.

It is an amenable number.

1378197241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378197241 is an equidigital number, since it uses as much as digits as its factorization.

1378197241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The square root of 1378197241 is about 37124.0789919427. The cubic root of 1378197241 is about 1112.8512690533.

The spelling of 1378197241 in words is "one billion, three hundred seventy-eight million, one hundred ninety-seven thousand, two hundred forty-one".