51864143 has 2 divisors, whose sum is σ = 51864144. Its totient is φ = 51864142.

The previous prime is 51864119. The next prime is 51864173. The reversal of 51864143 is 34146815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51864143 - 2¹⁴ = 51847759 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51864173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25932071 + 25932072.

It is an arithmetic number, because the mean of its divisors is an integer number (25932072).

Almost surely, 2^51864143 is an apocalyptic number.

51864143 is a deficient number, since it is larger than the sum of its proper divisors (1).

51864143 is an equidigital number, since it uses as much as digits as its factorization.

51864143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 51864143 is about 7201.6764020608. The cubic root of 51864143 is about 372.9257759240.

The spelling of 51864143 in words is "fifty-one million, eight hundred sixty-four thousand, one hundred forty-three".