1928381818201 has 2 divisors, whose sum is σ = 1928381818202. Its totient is φ = 1928381818200.

The previous prime is 1928381818199. The next prime is 1928381818267. The reversal of 1928381818201 is 1028181838291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1587587400025 + 340794418176 = 1259995^2 + 583776^2 .

It is an emirp because it is prime and its reverse (1028181838291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1928381818201 - 2¹ = 1928381818199 is a prime.

It is a super-2 number, since 2×1928381818201² (a number of 25 digits) contains 22 as substring.

Together with 1928381818199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1928381818291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964190909100 + 964190909101.

It is an arithmetic number, because the mean of its divisors is an integer number (964190909101).

Almost surely, 2^{1928381818201} is an apocalyptic number.

It is an amenable number.

1928381818201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928381818201 is an equidigital number, since it uses as much as digits as its factorization.

1928381818201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 52.

The spelling of 1928381818201 in words is "one trillion, nine hundred twenty-eight billion, three hundred eighty-one million, eight hundred eighteen thousand, two hundred one".