51550043 has 4 divisors (see below), whose sum is σ = 51794568. Its totient is φ = 51305520.

The previous prime is 51550039. The next prime is 51550049. The reversal of 51550043 is 34005515.

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 51550043 - 2² = 51550039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51550049) 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, 121946 + ... + 122367.

It is an arithmetic number, because the mean of its divisors is an integer number (12948642).

Almost surely, 2^51550043 is an apocalyptic number.

51550043 is a deficient number, since it is larger than the sum of its proper divisors (244525).

51550043 is a wasteful number, since it uses less digits than its factorization.

51550043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244524.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51550043 is about 7179.8358616336. The cubic root of 51550043 is about 372.1714124090.

Adding to 51550043 its reverse (34005515), we get a palindrome (85555558).

The spelling of 51550043 in words is "fifty-one million, five hundred fifty thousand, forty-three".