51023243 has 4 divisors (see below), whose sum is σ = 51052440. Its totient is φ = 50994048.

The previous prime is 51023237. The next prime is 51023257. The reversal of 51023243 is 34232015.

It is a happy number.

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 51023243 - 2²⁰ = 49974667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51023233) 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, 11798 + ... + 15531.

It is an arithmetic number, because the mean of its divisors is an integer number (12763110).

Almost surely, 2^51023243 is an apocalyptic number.

51023243 is a deficient number, since it is larger than the sum of its proper divisors (29197).

51023243 is a wasteful number, since it uses less digits than its factorization.

51023243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29196.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 51023243 is about 7143.0555786722. The cubic root of 51023243 is about 370.8993049934.

Adding to 51023243 its reverse (34232015), we get a palindrome (85255258).

The spelling of 51023243 in words is "fifty-one million, twenty-three thousand, two hundred forty-three".