285223139 has 2 divisors, whose sum is σ = 285223140. Its totient is φ = 285223138.

The previous prime is 285223123. The next prime is 285223151. The reversal of 285223139 is 931322582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285223139 - 2⁴ = 285223123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 285223099 and 285223108.

It is not a weakly prime, because it can be changed into another prime (285223189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142611569 + 142611570.

It is an arithmetic number, because the mean of its divisors is an integer number (142611570).

Almost surely, 2^285223139 is an apocalyptic number.

285223139 is a deficient number, since it is larger than the sum of its proper divisors (1).

285223139 is an equidigital number, since it uses as much as digits as its factorization.

285223139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 285223139 is about 16888.5505298708. The cubic root of 285223139 is about 658.2561394436.

The spelling of 285223139 in words is "two hundred eighty-five million, two hundred twenty-three thousand, one hundred thirty-nine".