63920551 has 4 divisors (see below), whose sum is σ = 64223704. Its totient is φ = 63617400.

The previous prime is 63920539. The next prime is 63920567. The reversal of 63920551 is 15502936.

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 63920551 - 2⁹ = 63920039 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 (63920531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151260 + ... + 151681.

It is an arithmetic number, because the mean of its divisors is an integer number (16055926).

Almost surely, 2^63920551 is an apocalyptic number.

63920551 is a deficient number, since it is larger than the sum of its proper divisors (303153).

63920551 is a wasteful number, since it uses less digits than its factorization.

63920551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303152.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 63920551 is about 7995.0328954921. The cubic root of 63920551 is about 399.8344127116.

The spelling of 63920551 in words is "sixty-three million, nine hundred twenty thousand, five hundred fifty-one".