1381979663 has 2 divisors, whose sum is σ = 1381979664. Its totient is φ = 1381979662.

The previous prime is 1381979639. The next prime is 1381979693. The reversal of 1381979663 is 3669791831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1381979663 - 2⁸ = 1381979407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381979603) 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, 690989831 + 690989832.

It is an arithmetic number, because the mean of its divisors is an integer number (690989832).

Almost surely, 2^1381979663 is an apocalyptic number.

1381979663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381979663 is an equidigital number, since it uses as much as digits as its factorization.

1381979663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 53.

The square root of 1381979663 is about 37174.9870611948. The cubic root of 1381979663 is about 1113.8684017045.

The spelling of 1381979663 in words is "one billion, three hundred eighty-one million, nine hundred seventy-nine thousand, six hundred sixty-three".