285312913 has 4 divisors (see below), whose sum is σ = 285361380. Its totient is φ = 285264448.

The previous prime is 285312899. The next prime is 285312931. The reversal of 285312913 is 319213582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126855169 + 158457744 = 11263^2 + 12588^2 .

It is a cyclic number.

It is not a de Polignac number, because 285312913 - 2²¹ = 283215761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285310913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13948 + ... + 27661.

It is an arithmetic number, because the mean of its divisors is an integer number (71340345).

Almost surely, 2^285312913 is an apocalyptic number.

It is an amenable number.

285312913 is a deficient number, since it is larger than the sum of its proper divisors (48467).

285312913 is an equidigital number, since it uses as much as digits as its factorization.

285312913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48466.

The product of its digits is 12960, while the sum is 34.

The square root of 285312913 is about 16891.2081569081. The cubic root of 285312913 is about 658.3251942521.

It can be divided in two parts, 285312 and 913, that added together give a square (286225 = 535²).

The spelling of 285312913 in words is "two hundred eighty-five million, three hundred twelve thousand, nine hundred thirteen".