63825991 has 4 divisors (see below), whose sum is σ = 63966112. Its totient is φ = 63685872.

The previous prime is 63825961. The next prime is 63826019. The reversal of 63825991 is 19952836.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 63825991 - 2⁷ = 63825863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63825901) 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, 69375 + ... + 70288.

It is an arithmetic number, because the mean of its divisors is an integer number (15991528).

Almost surely, 2^63825991 is an apocalyptic number.

63825991 is a deficient number, since it is larger than the sum of its proper divisors (140121).

63825991 is a wasteful number, since it uses less digits than its factorization.

63825991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140120.

The product of its digits is 116640, while the sum is 43.

The square root of 63825991 is about 7989.1170350671. The cubic root of 63825991 is about 399.6371522032.

The spelling of 63825991 in words is "sixty-three million, eight hundred twenty-five thousand, nine hundred ninety-one".