63738581 has 2 divisors, whose sum is σ = 63738582. Its totient is φ = 63738580.

The previous prime is 63738557. The next prime is 63738583. The reversal of 63738581 is 18583736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 5597956 = 7625^2 + 2366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63738581 is a prime.

It is a super-2 number, since 2×63738581² = 8125213415787122, which contains 22 as substring.

Together with 63738583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63738583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31869290 + 31869291.

It is an arithmetic number, because the mean of its divisors is an integer number (31869291).

Almost surely, 2^63738581 is an apocalyptic number.

It is an amenable number.

63738581 is a deficient number, since it is larger than the sum of its proper divisors (1).

63738581 is an equidigital number, since it uses as much as digits as its factorization.

63738581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 63738581 is about 7983.6445937930. The cubic root of 63738581 is about 399.4546338607.

The spelling of 63738581 in words is "sixty-three million, seven hundred thirty-eight thousand, five hundred eighty-one".