213909085 has 24 divisors (see below), whose sum is σ = 289024344. Its totient is φ = 151071360.

The previous prime is 213909037. The next prime is 213909089. The reversal of 213909085 is 580909312.

It can be written as a sum of positive squares in 4 ways, for example, as 5943844 + 207965241 = 2438^2 + 14421^2 .

It is a de Polignac number, because none of the positive numbers 2^k-213909085 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213909089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31275 + ... + 37495.

It is an arithmetic number, because the mean of its divisors is an integer number (12042681).

Almost surely, 2^213909085 is an apocalyptic number.

It is an amenable number.

213909085 is a deficient number, since it is larger than the sum of its proper divisors (75115259).

213909085 is a wasteful number, since it uses less digits than its factorization.

213909085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6285 (or 6262 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 213909085 is about 14625.6310974946. The cubic root of 213909085 is about 598.0576867427.

The spelling of 213909085 in words is "two hundred thirteen million, nine hundred nine thousand, eighty-five".