213567789 has 4 divisors (see below), whose sum is σ = 284757056. Its totient is φ = 142378524.

The previous prime is 213567779. The next prime is 213567791. The reversal of 213567789 is 987765312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 213567789 - 2⁷ = 213567661 is a prime.

It is a super-2 number, since 2×213567789² = 91222400996697042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213567709) 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, 35594629 + ... + 35594634.

It is an arithmetic number, because the mean of its divisors is an integer number (71189264).

Almost surely, 2^213567789 is an apocalyptic number.

It is an amenable number.

213567789 is a deficient number, since it is larger than the sum of its proper divisors (71189267).

213567789 is an equidigital number, since it uses as much as digits as its factorization.

213567789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71189266.

The product of its digits is 635040, while the sum is 48.

The square root of 213567789 is about 14613.9587039241. The cubic root of 213567789 is about 597.7394466379.

The spelling of 213567789 in words is "two hundred thirteen million, five hundred sixty-seven thousand, seven hundred eighty-nine".