1378729601 has 2 divisors, whose sum is σ = 1378729602. Its totient is φ = 1378729600.

The previous prime is 1378729553. The next prime is 1378729603. The reversal of 1378729601 is 1069278731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 985897201 + 392832400 = 31399^2 + 19820^2 .

It is an emirp because it is prime and its reverse (1069278731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378729601 is a prime.

Together with 1378729603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1378729603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689364800 + 689364801.

It is an arithmetic number, because the mean of its divisors is an integer number (689364801).

Almost surely, 2^1378729601 is an apocalyptic number.

It is an amenable number.

1378729601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378729601 is an equidigital number, since it uses as much as digits as its factorization.

1378729601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 1378729601 is about 37131.2483092072. The cubic root of 1378729601 is about 1112.9945386375.

The spelling of 1378729601 in words is "one billion, three hundred seventy-eight million, seven hundred twenty-nine thousand, six hundred one".