63181994 has 8 divisors (see below), whose sum is σ = 94875300. Its totient is φ = 31556896.

The previous prime is 63181991. The next prime is 63181997. The reversal of 63181994 is 49918136.

It is an interprime number because it is at equal distance from previous prime (63181991) and next prime (63181997).

It can be written as a sum of positive squares in 2 ways, for example, as 56806369 + 6375625 = 7537^2 + 2525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (63181991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14669 + ... + 18480.

Almost surely, 2^63181994 is an apocalyptic number.

63181994 is a deficient number, since it is larger than the sum of its proper divisors (31693306).

63181994 is a wasteful number, since it uses less digits than its factorization.

63181994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34104.

The product of its digits is 46656, while the sum is 41.

The square root of 63181994 is about 7948.7102098391. The cubic root of 63181994 is about 398.2885082679.

The spelling of 63181994 in words is "sixty-three million, one hundred eighty-one thousand, nine hundred ninety-four".