285180221 has 2 divisors, whose sum is σ = 285180222. Its totient is φ = 285180220.

The previous prime is 285180209. The next prime is 285180239. The reversal of 285180221 is 122081582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261307225 + 23872996 = 16165^2 + 4886^2 .

It is a cyclic number.

It is not a de Polignac number, because 285180221 - 2¹⁰ = 285179197 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 (285180251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142590110 + 142590111.

It is an arithmetic number, because the mean of its divisors is an integer number (142590111).

Almost surely, 2^285180221 is an apocalyptic number.

It is an amenable number.

285180221 is a deficient number, since it is larger than the sum of its proper divisors (1).

285180221 is an equidigital number, since it uses as much as digits as its factorization.

285180221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 285180221 is about 16887.2798579286. The cubic root of 285180221 is about 658.2231214888.

The spelling of 285180221 in words is "two hundred eighty-five million, one hundred eighty thousand, two hundred twenty-one".