285239197 has 2 divisors, whose sum is σ = 285239198. Its totient is φ = 285239196.

The previous prime is 285239189. The next prime is 285239203. The reversal of 285239197 is 791932582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268107876 + 17131321 = 16374^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 285239197 - 2³ = 285239189 is a prime.

It is a super-2 number, since 2×285239197² = 162722799010409618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285239147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142619598 + 142619599.

It is an arithmetic number, because the mean of its divisors is an integer number (142619599).

Almost surely, 2^285239197 is an apocalyptic number.

It is an amenable number.

285239197 is a deficient number, since it is larger than the sum of its proper divisors (1).

285239197 is an equidigital number, since it uses as much as digits as its factorization.

285239197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 285239197 is about 16889.0259340200. The cubic root of 285239197 is about 658.2684924371.

The spelling of 285239197 in words is "two hundred eighty-five million, two hundred thirty-nine thousand, one hundred ninety-seven".