213528969 has 6 divisors (see below), whose sum is σ = 308430746. Its totient is φ = 142352640.

The previous prime is 213528947. The next prime is 213528971. The reversal of 213528969 is 969825312.

It can be written as a sum of positive squares in only one way, i.e., 146894400 + 66634569 = 12120^2 + 8163^2 .

It is not a de Polignac number, because 213528969 - 2⁵ = 213528937 is a prime.

It is a super-2 number, since 2×213528969² = 91189241204405922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213528569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11862712 + ... + 11862729.

Almost surely, 2^213528969 is an apocalyptic number.

It is an amenable number.

213528969 is a deficient number, since it is larger than the sum of its proper divisors (94901777).

213528969 is a wasteful number, since it uses less digits than its factorization.

213528969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23725447 (or 23725444 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 213528969 is about 14612.6304613509. The cubic root of 213528969 is about 597.7032276127.

The spelling of 213528969 in words is "two hundred thirteen million, five hundred twenty-eight thousand, nine hundred sixty-nine".