285133861 has 2 divisors, whose sum is σ = 285133862. Its totient is φ = 285133860.

The previous prime is 285133837. The next prime is 285133907. The reversal of 285133861 is 168331582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279224100 + 5909761 = 16710^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 285133861 - 2⁷ = 285133733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285133861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285133811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142566930 + 142566931.

It is an arithmetic number, because the mean of its divisors is an integer number (142566931).

Almost surely, 2^285133861 is an apocalyptic number.

It is an amenable number.

285133861 is a deficient number, since it is larger than the sum of its proper divisors (1).

285133861 is an equidigital number, since it uses as much as digits as its factorization.

285133861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 285133861 is about 16885.9071713663. The cubic root of 285133861 is about 658.1874517902.

The spelling of 285133861 in words is "two hundred eighty-five million, one hundred thirty-three thousand, eight hundred sixty-one".