213833951951 has 4 divisors (see below), whose sum is σ = 217868554872. Its totient is φ = 209799349032.

The previous prime is 213833951911. The next prime is 213833951953. The reversal of 213833951951 is 159159338312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213833951951 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 213833951951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213833951953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017301381 + ... + 2017301486.

It is an arithmetic number, because the mean of its divisors is an integer number (54467138718).

Almost surely, 2^213833951951 is an apocalyptic number.

213833951951 is a deficient number, since it is larger than the sum of its proper divisors (4034602921).

213833951951 is an equidigital number, since it uses as much as digits as its factorization.

213833951951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034602920.

The product of its digits is 874800, while the sum is 50.

The spelling of 213833951951 in words is "two hundred thirteen billion, eight hundred thirty-three million, nine hundred fifty-one thousand, nine hundred fifty-one".