285379309 has 2 divisors, whose sum is σ = 285379310. Its totient is φ = 285379308.

The previous prime is 285379307. The next prime is 285379337. The reversal of 285379309 is 903973582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232410025 + 52969284 = 15245^2 + 7278^2 .

It is a cyclic number.

It is not a de Polignac number, because 285379309 - 2¹ = 285379307 is a prime.

Together with 285379307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285379307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142689654 + 142689655.

It is an arithmetic number, because the mean of its divisors is an integer number (142689655).

Almost surely, 2^285379309 is an apocalyptic number.

It is an amenable number.

285379309 is a deficient number, since it is larger than the sum of its proper divisors (1).

285379309 is an equidigital number, since it uses as much as digits as its factorization.

285379309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 285379309 is about 16893.1734437316. The cubic root of 285379309 is about 658.3762572166.

The spelling of 285379309 in words is "two hundred eighty-five million, three hundred seventy-nine thousand, three hundred nine".