51331243 has 2 divisors, whose sum is σ = 51331244. Its totient is φ = 51331242.

The previous prime is 51331229. The next prime is 51331249. The reversal of 51331243 is 34213315.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51331243 is a prime.

It is a nialpdrome in base 13.

It is not a weakly prime, because it can be changed into another prime (51331249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25665621 + 25665622.

It is an arithmetic number, because the mean of its divisors is an integer number (25665622).

Almost surely, 2^51331243 is an apocalyptic number.

51331243 is a deficient number, since it is larger than the sum of its proper divisors (1).

51331243 is an equidigital number, since it uses as much as digits as its factorization.

51331243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 22.

The square root of 51331243 is about 7164.5825419211. The cubic root of 51331243 is about 371.6441151655.

Adding to 51331243 its reverse (34213315), we get a palindrome (85544558).

The spelling of 51331243 in words is "fifty-one million, three hundred thirty-one thousand, two hundred forty-three".