51223243 has 4 divisors (see below), whose sum is σ = 51378328. Its totient is φ = 51068160.

The previous prime is 51223217. The next prime is 51223247. The reversal of 51223243 is 34232215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51223243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51223247) 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, 77046 + ... + 77707.

It is an arithmetic number, because the mean of its divisors is an integer number (12844582).

Almost surely, 2^51223243 is an apocalyptic number.

51223243 is a deficient number, since it is larger than the sum of its proper divisors (155085).

51223243 is a wasteful number, since it uses less digits than its factorization.

51223243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155084.

The product of its digits is 1440, while the sum is 22.

The square root of 51223243 is about 7157.0414977140. The cubic root of 51223243 is about 371.3832880058.

Adding to 51223243 its reverse (34232215), we get a palindrome (85455458).

The spelling of 51223243 in words is "fifty-one million, two hundred twenty-three thousand, two hundred forty-three".