1381378651 has 2 divisors, whose sum is σ = 1381378652. Its totient is φ = 1381378650.

The previous prime is 1381378637. The next prime is 1381378657. The reversal of 1381378651 is 1568731831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381378651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381378598 and 1381378607.

It is not a weakly prime, because it can be changed into another prime (1381378657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690689325 + 690689326.

It is an arithmetic number, because the mean of its divisors is an integer number (690689326).

Almost surely, 2^1381378651 is an apocalyptic number.

1381378651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381378651 is an equidigital number, since it uses as much as digits as its factorization.

1381378651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 1381378651 is about 37166.9026285484. The cubic root of 1381378651 is about 1113.7069074455.

The spelling of 1381378651 in words is "one billion, three hundred eighty-one million, three hundred seventy-eight thousand, six hundred fifty-one".