213564987 has 6 divisors (see below), whose sum is σ = 308482772. Its totient is φ = 142376652.

The previous prime is 213564973. The next prime is 213564991. The reversal of 213564987 is 789465312.

213564987 is a `hidden beast` number, since 2 + 1 + 3 + 564 + 9 + 87 = 666.

It is not a de Polignac number, because 213564987 - 2⁴ = 213564971 is a prime.

It is a super-2 number, since 2×213564987² = 91220007344620338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213564587) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11864713 + ... + 11864730.

Almost surely, 2^213564987 is an apocalyptic number.

213564987 is a deficient number, since it is larger than the sum of its proper divisors (94917785).

213564987 is a wasteful number, since it uses less digits than its factorization.

213564987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23729449 (or 23729446 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213564987 is about 14613.8628363619. The cubic root of 213564987 is about 597.7368325214.

The spelling of 213564987 in words is "two hundred thirteen million, five hundred sixty-four thousand, nine hundred eighty-seven".