4243721831 has 2 divisors, whose sum is σ = 4243721832. Its totient is φ = 4243721830.

The previous prime is 4243721737. The next prime is 4243721869. The reversal of 4243721831 is 1381273424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4243721831 - 2¹⁰ = 4243720807 is a prime.

It is a super-2 number, since 2×4243721831² = 36018349957811985122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 4243721791 and 4243721800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4243721431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121860915 + 2121860916.

It is an arithmetic number, because the mean of its divisors is an integer number (2121860916).

Almost surely, 2^4243721831 is an apocalyptic number.

4243721831 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243721831 is an equidigital number, since it uses as much as digits as its factorization.

4243721831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 4243721831 is about 65143.8548982174. The cubic root of 4243721831 is about 1619.0079063815.

The spelling of 4243721831 in words is "four billion, two hundred forty-three million, seven hundred twenty-one thousand, eight hundred thirty-one".