51031243 has 4 divisors (see below), whose sum is σ = 51061648. Its totient is φ = 51000840.

The previous prime is 51031241. The next prime is 51031261. The reversal of 51031243 is 34213015.

51031243 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 51031243 - 2¹ = 51031241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51031243.

It is not an unprimeable number, because it can be changed into a prime (51031241) 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, 12528 + ... + 16093.

It is an arithmetic number, because the mean of its divisors is an integer number (12765412).

Almost surely, 2^51031243 is an apocalyptic number.

51031243 is a deficient number, since it is larger than the sum of its proper divisors (30405).

51031243 is a wasteful number, since it uses less digits than its factorization.

51031243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30404.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51031243 is about 7143.6155411668. The cubic root of 51031243 is about 370.9186885736.

Adding to 51031243 its reverse (34213015), we get a palindrome (85244258).

The spelling of 51031243 in words is "fifty-one million, thirty-one thousand, two hundred forty-three".