51839243 has 2 divisors, whose sum is σ = 51839244. Its totient is φ = 51839242.

The previous prime is 51839231. The next prime is 51839251. The reversal of 51839243 is 34293815.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51839243 is a prime.

It is a super-2 number, since 2×51839243² = 5374614229626098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51839743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25919621 + 25919622.

It is an arithmetic number, because the mean of its divisors is an integer number (25919622).

Almost surely, 2^51839243 is an apocalyptic number.

51839243 is a deficient number, since it is larger than the sum of its proper divisors (1).

51839243 is an equidigital number, since it uses as much as digits as its factorization.

51839243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 51839243 is about 7199.9474303636. The cubic root of 51839243 is about 372.8660857558.

The spelling of 51839243 in words is "fifty-one million, eight hundred thirty-nine thousand, two hundred forty-three".