63438919 has 2 divisors, whose sum is σ = 63438920. Its totient is φ = 63438918.

The previous prime is 63438911. The next prime is 63438923. The reversal of 63438919 is 91983436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63438919 - 2³ = 63438911 is a prime.

It is a super-2 number, since 2×63438919² = 8048992887777122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63438911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31719459 + 31719460.

It is an arithmetic number, because the mean of its divisors is an integer number (31719460).

Almost surely, 2^63438919 is an apocalyptic number.

63438919 is a deficient number, since it is larger than the sum of its proper divisors (1).

63438919 is an equidigital number, since it uses as much as digits as its factorization.

63438919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 63438919 is about 7964.8552403669. The cubic root of 63438919 is about 398.8276485873.

The spelling of 63438919 in words is "sixty-three million, four hundred thirty-eight thousand, nine hundred nineteen".