51355243 has 4 divisors (see below), whose sum is σ = 51392088. Its totient is φ = 51318400.

The previous prime is 51355237. The next prime is 51355253. The reversal of 51355243 is 34255315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34255315 = 5 ⋅6851063.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51355243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51355253) 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, 16246 + ... + 19147.

It is an arithmetic number, because the mean of its divisors is an integer number (12848022).

Almost surely, 2^51355243 is an apocalyptic number.

51355243 is a deficient number, since it is larger than the sum of its proper divisors (36845).

51355243 is a wasteful number, since it uses less digits than its factorization.

51355243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36844.

The product of its digits is 9000, while the sum is 28.

The square root of 51355243 is about 7166.2572518714. The cubic root of 51355243 is about 371.7020270628.

The spelling of 51355243 in words is "fifty-one million, three hundred fifty-five thousand, two hundred forty-three".