51857189 has 2 divisors, whose sum is σ = 51857190. Its totient is φ = 51857188.

The previous prime is 51857177. The next prime is 51857207. The reversal of 51857189 is 98175815.

It is a happy number.

51857189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36120100 + 15737089 = 6010^2 + 3967^2 .

It is a cyclic number.

It is not a de Polignac number, because 51857189 - 2⁴ = 51857173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51857119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25928594 + 25928595.

It is an arithmetic number, because the mean of its divisors is an integer number (25928595).

Almost surely, 2^51857189 is an apocalyptic number.

It is an amenable number.

51857189 is a deficient number, since it is larger than the sum of its proper divisors (1).

51857189 is an equidigital number, since it uses as much as digits as its factorization.

51857189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 44.

The square root of 51857189 is about 7201.1935816224. The cubic root of 51857189 is about 372.9091077495.

The spelling of 51857189 in words is "fifty-one million, eight hundred fifty-seven thousand, one hundred eighty-nine".