1964438563 has 2 divisors, whose sum is σ = 1964438564. Its totient is φ = 1964438562.

The previous prime is 1964438561. The next prime is 1964438591. The reversal of 1964438563 is 3658344691.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3658344691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1964438563 - 2¹ = 1964438561 is a prime.

Together with 1964438561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1964438561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982219281 + 982219282.

It is an arithmetic number, because the mean of its divisors is an integer number (982219282).

Almost surely, 2^1964438563 is an apocalyptic number.

1964438563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964438563 is an equidigital number, since it uses as much as digits as its factorization.

1964438563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 49.

The square root of 1964438563 is about 44321.9873539082. The cubic root of 1964438563 is about 1252.4089148280.

The spelling of 1964438563 in words is "one billion, nine hundred sixty-four million, four hundred thirty-eight thousand, five hundred sixty-three".