213485687 has 4 divisors (see below), whose sum is σ = 213968040. Its totient is φ = 213003336.

The previous prime is 213485641. The next prime is 213485693. The reversal of 213485687 is 786584312.

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 213485687 - 2¹² = 213481591 is a prime.

It is a super-2 number, since 2×213485687² = 91152277107723938, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213485087) 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, 240512 + ... + 241397.

It is an arithmetic number, because the mean of its divisors is an integer number (53492010).

Almost surely, 2^213485687 is an apocalyptic number.

213485687 is a deficient number, since it is larger than the sum of its proper divisors (482353).

213485687 is an equidigital number, since it uses as much as digits as its factorization.

213485687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482352.

The product of its digits is 322560, while the sum is 44.

The square root of 213485687 is about 14611.1494072164. The cubic root of 213485687 is about 597.6628403695.

The spelling of 213485687 in words is "two hundred thirteen million, four hundred eighty-five thousand, six hundred eighty-seven".