51568819 has 4 divisors (see below), whose sum is σ = 51591600. Its totient is φ = 51546040.

The previous prime is 51568817. The next prime is 51568859. The reversal of 51568819 is 91886515.

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 51568819 - 2¹ = 51568817 is a prime.

It is a super-2 number, since 2×51568819² = 5318686186109522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51568817) 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, 7567 + ... + 12664.

It is an arithmetic number, because the mean of its divisors is an integer number (12897900).

Almost surely, 2^51568819 is an apocalyptic number.

51568819 is a deficient number, since it is larger than the sum of its proper divisors (22781).

51568819 is a wasteful number, since it uses less digits than its factorization.

51568819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22780.

The product of its digits is 86400, while the sum is 43.

The square root of 51568819 is about 7181.1432933761. The cubic root of 51568819 is about 372.2165920817.

The spelling of 51568819 in words is "fifty-one million, five hundred sixty-eight thousand, eight hundred nineteen".