63812991 has 8 divisors (see below), whose sum is σ = 92818944. Its totient is φ = 38674520.

The previous prime is 63812977. The next prime is 63812999. The reversal of 63812991 is 19921836.

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

It is a cyclic number.

It is not a de Polignac number, because 63812991 - 2⁷ = 63812863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63812999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 966831 + ... + 966896.

It is an arithmetic number, because the mean of its divisors is an integer number (11602368).

Almost surely, 2^63812991 is an apocalyptic number.

63812991 is a deficient number, since it is larger than the sum of its proper divisors (29005953).

63812991 is a wasteful number, since it uses less digits than its factorization.

63812991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933741.

The product of its digits is 23328, while the sum is 39.

The square root of 63812991 is about 7988.3033868275. The cubic root of 63812991 is about 399.6100178250.

The spelling of 63812991 in words is "sixty-three million, eight hundred twelve thousand, nine hundred ninety-one".