63881399 has 2 divisors, whose sum is σ = 63881400. Its totient is φ = 63881398.

The previous prime is 63881371. The next prime is 63881423. The reversal of 63881399 is 99318836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63881399 - 2²⁰ = 62832823 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 (63881339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31940699 + 31940700.

It is an arithmetic number, because the mean of its divisors is an integer number (31940700).

Almost surely, 2^63881399 is an apocalyptic number.

63881399 is a deficient number, since it is larger than the sum of its proper divisors (1).

63881399 is an equidigital number, since it uses as much as digits as its factorization.

63881399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 63881399 is about 7992.5840001842. The cubic root of 63881399 is about 399.7527617980.

The spelling of 63881399 in words is "sixty-three million, eight hundred eighty-one thousand, three hundred ninety-nine".