4821863981 has 4 divisors (see below), whose sum is σ = 5260215264. Its totient is φ = 4383512700.

The previous prime is 4821863929. The next prime is 4821863989. The reversal of 4821863981 is 1893681284.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4821863981 is a prime.

It is a super-2 number, since 2×4821863981² = 46500744502530336722, 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 (4821863989) 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, 219175625 + ... + 219175646.

It is an arithmetic number, because the mean of its divisors is an integer number (1315053816).

Almost surely, 2^4821863981 is an apocalyptic number.

It is an amenable number.

4821863981 is a deficient number, since it is larger than the sum of its proper divisors (438351283).

4821863981 is a wasteful number, since it uses less digits than its factorization.

4821863981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438351282.

The product of its digits is 663552, while the sum is 50.

The square root of 4821863981 is about 69439.6427194150. The cubic root of 4821863981 is about 1689.4226732643.

The spelling of 4821863981 in words is "four billion, eight hundred twenty-one million, eight hundred sixty-three thousand, nine hundred eighty-one".