51871243 has 2 divisors, whose sum is σ = 51871244. Its totient is φ = 51871242.

The previous prime is 51871241. The next prime is 51871283. The reversal of 51871243 is 34217815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51871243 - 2¹ = 51871241 is a prime.

Together with 51871241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51871241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25935621 + 25935622.

It is an arithmetic number, because the mean of its divisors is an integer number (25935622).

Almost surely, 2^51871243 is an apocalyptic number.

51871243 is a deficient number, since it is larger than the sum of its proper divisors (1).

51871243 is an equidigital number, since it uses as much as digits as its factorization.

51871243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 51871243 is about 7202.1693259739. The cubic root of 51871243 is about 372.9427925116.

The spelling of 51871243 in words is "fifty-one million, eight hundred seventy-one thousand, two hundred forty-three".