51563819 has 4 divisors (see below), whose sum is σ = 53227200. Its totient is φ = 49900440.

The previous prime is 51563801. The next prime is 51563851. The reversal of 51563819 is 91836515.

51563819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51563819 is a prime.

It is a super-2 number, since 2×51563819² = 5317654859729522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51563879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831644 + ... + 831705.

It is an arithmetic number, because the mean of its divisors is an integer number (13306800).

Almost surely, 2^51563819 is an apocalyptic number.

51563819 is a deficient number, since it is larger than the sum of its proper divisors (1663381).

51563819 is a wasteful number, since it uses less digits than its factorization.

51563819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663380.

The product of its digits is 32400, while the sum is 38.

The square root of 51563819 is about 7180.7951509565. The cubic root of 51563819 is about 372.2045619238.

The spelling of 51563819 in words is "fifty-one million, five hundred sixty-three thousand, eight hundred nineteen".