213841891 has 4 divisors (see below), whose sum is σ = 213905952. Its totient is φ = 213777832.

The previous prime is 213841871. The next prime is 213841921. The reversal of 213841891 is 198148312.

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 213841891 - 2¹³ = 213833699 is a prime.

It is a super-3 number, since 3×213841891³ (a number of 26 digits) contains 333 as substring.

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 213841891.

It is not an unprimeable number, because it can be changed into a prime (213841811) 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, 26731 + ... + 33796.

It is an arithmetic number, because the mean of its divisors is an integer number (53476488).

Almost surely, 2^213841891 is an apocalyptic number.

213841891 is a deficient number, since it is larger than the sum of its proper divisors (64061).

213841891 is an equidigital number, since it uses as much as digits as its factorization.

213841891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64060.

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

The square root of 213841891 is about 14623.3337854266. Note that the first 3 decimals coincide. The cubic root of 213841891 is about 597.9950587393.

The spelling of 213841891 in words is "two hundred thirteen million, eight hundred forty-one thousand, eight hundred ninety-one".