51428189 has 2 divisors, whose sum is σ = 51428190. Its totient is φ = 51428188.

The previous prime is 51428173. The next prime is 51428197. The reversal of 51428189 is 98182415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31024900 + 20403289 = 5570^2 + 4517^2 .

It is a cyclic number.

It is not a de Polignac number, because 51428189 - 2⁴ = 51428173 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 (51428149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25714094 + 25714095.

It is an arithmetic number, because the mean of its divisors is an integer number (25714095).

Almost surely, 2^51428189 is an apocalyptic number.

It is an amenable number.

51428189 is a deficient number, since it is larger than the sum of its proper divisors (1).

51428189 is an equidigital number, since it uses as much as digits as its factorization.

51428189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 38.

The square root of 51428189 is about 7171.3449923986. The cubic root of 51428189 is about 371.8779347649.

It can be divided in two parts, 5142 and 8189, that added together give a palindrome (13331).

The spelling of 51428189 in words is "fifty-one million, four hundred twenty-eight thousand, one hundred eighty-nine".