4237642238891 has 2 divisors, whose sum is σ = 4237642238892. Its totient is φ = 4237642238890.

The previous prime is 4237642238777. The next prime is 4237642238989. The reversal of 4237642238891 is 1988322467324.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4237642238891 is a prime.

It is a super-2 number, since 2×4237642238891² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4237642238891.

It is not a weakly prime, because it can be changed into another prime (4257642238891) 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 as a sum of consecutive naturals, namely, 2118821119445 + 2118821119446.

It is an arithmetic number, because the mean of its divisors is an integer number (2118821119446).

Almost surely, 2^{4237642238891} is an apocalyptic number.

4237642238891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4237642238891 is an equidigital number, since it uses as much as digits as its factorization.

4237642238891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 59.

The spelling of 4237642238891 in words is "four trillion, two hundred thirty-seven billion, six hundred forty-two million, two hundred thirty-eight thousand, eight hundred ninety-one".