213781856983 has 4 divisors (see below), whose sum is σ = 214715402440. Its totient is φ = 212848311528.

The previous prime is 213781856963. The next prime is 213781856987. The reversal of 213781856983 is 389658187312.

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-213781856983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213781856987) 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, 466772385 + ... + 466772842.

It is an arithmetic number, because the mean of its divisors is an integer number (53678850610).

Almost surely, 2^213781856983 is an apocalyptic number.

213781856983 is a deficient number, since it is larger than the sum of its proper divisors (933545457).

213781856983 is an equidigital number, since it uses as much as digits as its factorization.

213781856983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933545456.

The product of its digits is 17418240, while the sum is 61.

The spelling of 213781856983 in words is "two hundred thirteen billion, seven hundred eighty-one million, eight hundred fifty-six thousand, nine hundred eighty-three".