213418891 has 4 divisors (see below), whose sum is σ = 243907312. Its totient is φ = 182930472.

The previous prime is 213418889. The next prime is 213418897. The reversal of 213418891 is 198814312.

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 213418891 - 2¹ = 213418889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213418891.

It is not an unprimeable number, because it can be changed into a prime (213418897) 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 3 ways as a sum of consecutive naturals, for example, 15244200 + ... + 15244213.

It is an arithmetic number, because the mean of its divisors is an integer number (60976828).

Almost surely, 2^213418891 is an apocalyptic number.

213418891 is a deficient number, since it is larger than the sum of its proper divisors (30488421).

213418891 is an equidigital number, since it uses as much as digits as its factorization.

213418891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30488420.

The product of its digits is 13824, while the sum is 37.

The square root of 213418891 is about 14608.8634397067. The cubic root of 213418891 is about 597.6005010593.

It can be divided in two parts, 2134 and 18891, that added together give a square (21025 = 145²).

The spelling of 213418891 in words is "two hundred thirteen million, four hundred eighteen thousand, eight hundred ninety-one".