51986243 has 2 divisors, whose sum is σ = 51986244. Its totient is φ = 51986242.

The previous prime is 51986227. The next prime is 51986267. The reversal of 51986243 is 34268915.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51986243 - 2⁴ = 51986227 is a prime.

It is a super-2 number, since 2×51986243² = 5405138922510098, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51986197 and 51986206.

It is not a weakly prime, because it can be changed into another prime (51986203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25993121 + 25993122.

It is an arithmetic number, because the mean of its divisors is an integer number (25993122).

Almost surely, 2^51986243 is an apocalyptic number.

51986243 is a deficient number, since it is larger than the sum of its proper divisors (1).

51986243 is an equidigital number, since it uses as much as digits as its factorization.

51986243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 51986243 is about 7210.1486115059. The cubic root of 51986243 is about 373.2181972940.

The spelling of 51986243 in words is "fifty-one million, nine hundred eighty-six thousand, two hundred forty-three".