63443381 has 4 divisors (see below), whose sum is σ = 63679500. Its totient is φ = 63207264.

The previous prime is 63443377. The next prime is 63443411. The reversal of 63443381 is 18334436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6682225 + 56761156 = 2585^2 + 7534^2 .

It is a cyclic number.

It is not a de Polignac number, because 63443381 - 2² = 63443377 is a prime.

It is a super-2 number, since 2×63443381² = 8050125185422322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63443321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117656 + ... + 118193.

It is an arithmetic number, because the mean of its divisors is an integer number (15919875).

Almost surely, 2^63443381 is an apocalyptic number.

It is an amenable number.

63443381 is a deficient number, since it is larger than the sum of its proper divisors (236119).

63443381 is a wasteful number, since it uses less digits than its factorization.

63443381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236118.

The product of its digits is 20736, while the sum is 32.

The square root of 63443381 is about 7965.1353409719. The cubic root of 63443381 is about 398.8369989318.

The spelling of 63443381 in words is "sixty-three million, four hundred forty-three thousand, three hundred eighty-one".