285142189 has 2 divisors, whose sum is σ = 285142190. Its totient is φ = 285142188.

The previous prime is 285142171. The next prime is 285142217. The reversal of 285142189 is 981241582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213452100 + 71690089 = 14610^2 + 8467^2 .

It is a cyclic number.

It is not a de Polignac number, because 285142189 - 2¹³ = 285133997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285143189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142571094 + 142571095.

It is an arithmetic number, because the mean of its divisors is an integer number (142571095).

Almost surely, 2^285142189 is an apocalyptic number.

It is an amenable number.

285142189 is a deficient number, since it is larger than the sum of its proper divisors (1).

285142189 is an equidigital number, since it uses as much as digits as its factorization.

285142189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 40.

The square root of 285142189 is about 16886.1537657336. The cubic root of 285142189 is about 658.1938596948.

It can be divided in two parts, 28514 and 2189, that added together give a palindrome (30703).

The spelling of 285142189 in words is "two hundred eighty-five million, one hundred forty-two thousand, one hundred eighty-nine".