51331223 has 2 divisors, whose sum is σ = 51331224. Its totient is φ = 51331222.

The previous prime is 51331213. The next prime is 51331229. The reversal of 51331223 is 32213315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51331223 - 2¹⁰ = 51330199 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 51331195 and 51331204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51331229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25665611 + 25665612.

It is an arithmetic number, because the mean of its divisors is an integer number (25665612).

Almost surely, 2^51331223 is an apocalyptic number.

51331223 is a deficient number, since it is larger than the sum of its proper divisors (1).

51331223 is an equidigital number, since it uses as much as digits as its factorization.

51331223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 20.

The square root of 51331223 is about 7164.5811461662. The cubic root of 51331223 is about 371.6440668981.

Adding to 51331223 its reverse (32213315), we get a palindrome (83544538).

The spelling of 51331223 in words is "fifty-one million, three hundred thirty-one thousand, two hundred twenty-three".