228185721893 has 2 divisors, whose sum is σ = 228185721894. Its totient is φ = 228185721892.

The previous prime is 228185721853. The next prime is 228185721899. The reversal of 228185721893 is 398127581822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139877496004 + 88308225889 = 374002^2 + 297167^2 .

It is a cyclic number.

It is not a de Polignac number, because 228185721893 - 2³⁶ = 159466245157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228185721899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114092860946 + 114092860947.

It is an arithmetic number, because the mean of its divisors is an integer number (114092860947).

Almost surely, 2^228185721893 is an apocalyptic number.

It is an amenable number.

228185721893 is a deficient number, since it is larger than the sum of its proper divisors (1).

228185721893 is an equidigital number, since it uses as much as digits as its factorization.

228185721893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 56.

The spelling of 228185721893 in words is "two hundred twenty-eight billion, one hundred eighty-five million, seven hundred twenty-one thousand, eight hundred ninety-three".