1678431563 has 2 divisors, whose sum is σ = 1678431564. Its totient is φ = 1678431562.

The previous prime is 1678431527. The next prime is 1678431571. The reversal of 1678431563 is 3651348761.

It is a strong prime.

It is an emirp because it is prime and its reverse (3651348761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1678431563 - 2¹² = 1678427467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1678431583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839215781 + 839215782.

It is an arithmetic number, because the mean of its divisors is an integer number (839215782).

Almost surely, 2^1678431563 is an apocalyptic number.

1678431563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678431563 is an equidigital number, since it uses as much as digits as its factorization.

1678431563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 1678431563 is about 40968.6656238643. The cubic root of 1678431563 is about 1188.4143282584.

The spelling of 1678431563 in words is "one billion, six hundred seventy-eight million, four hundred thirty-one thousand, five hundred sixty-three".