213685287 has 4 divisors (see below), whose sum is σ = 284913720. Its totient is φ = 142456856.

The previous prime is 213685271. The next prime is 213685289. The reversal of 213685287 is 782586312.

213685287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 213685287 - 2⁴ = 213685271 is a prime.

It is a super-2 number, since 2×213685287² = 91322803760544738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213685289) 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, 35614212 + ... + 35614217.

It is an arithmetic number, because the mean of its divisors is an integer number (71228430).

Almost surely, 2^213685287 is an apocalyptic number.

213685287 is a deficient number, since it is larger than the sum of its proper divisors (71228433).

213685287 is an equidigital number, since it uses as much as digits as its factorization.

213685287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71228432.

The product of its digits is 161280, while the sum is 42.

The square root of 213685287 is about 14617.9782117774. The cubic root of 213685287 is about 597.8490454274.

The spelling of 213685287 in words is "two hundred thirteen million, six hundred eighty-five thousand, two hundred eighty-seven".