51001943 has 4 divisors (see below), whose sum is σ = 51045888. Its totient is φ = 50958000.

The previous prime is 51001939. The next prime is 51001963. The reversal of 51001943 is 34910015.

It is a happy number.

51001943 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 not a de Polignac number, because 51001943 - 2² = 51001939 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 (51001963) 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, 20183 + ... + 22568.

It is an arithmetic number, because the mean of its divisors is an integer number (12761472).

Almost surely, 2^51001943 is an apocalyptic number.

51001943 is a deficient number, since it is larger than the sum of its proper divisors (43945).

51001943 is a wasteful number, since it uses less digits than its factorization.

51001943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43944.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 51001943 is about 7141.5644644574. The cubic root of 51001943 is about 370.8476863302.

Adding to 51001943 its reverse (34910015), we get a palindrome (85911958).

The spelling of 51001943 in words is "fifty-one million, one thousand, nine hundred forty-three".