1378023641 has 2 divisors, whose sum is σ = 1378023642. Its totient is φ = 1378023640.

The previous prime is 1378023637. The next prime is 1378023643. The reversal of 1378023641 is 1463208731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772617616 + 605406025 = 27796^2 + 24605^2 .

It is an emirp because it is prime and its reverse (1463208731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378023641 - 2² = 1378023637 is a prime.

Together with 1378023643, 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 (1378023643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689011820 + 689011821.

It is an arithmetic number, because the mean of its divisors is an integer number (689011821).

Almost surely, 2^1378023641 is an apocalyptic number.

It is an amenable number.

1378023641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378023641 is an equidigital number, since it uses as much as digits as its factorization.

1378023641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1378023641 is about 37121.7408131677. The cubic root of 1378023641 is about 1112.8045415635.

The spelling of 1378023641 in words is "one billion, three hundred seventy-eight million, twenty-three thousand, six hundred forty-one".