193887897995401 has 2 divisors, whose sum is σ = 193887897995402. Its totient is φ = 193887897995400.

The previous prime is 193887897995387. The next prime is 193887897995443. The reversal of 193887897995401 is 104599798788391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139392851925625 + 54495046069776 = 11806475^2 + 7382076^2 .

It is a cyclic number.

It is not a de Polignac number, because 193887897995401 - 2¹¹ = 193887897993353 is a prime.

It is a super-2 number, since 2×193887897995401² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (193887897995801) 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, 96943948997700 + 96943948997701.

It is an arithmetic number, because the mean of its divisors is an integer number (96943948997701).

Almost surely, 2^{193887897995401} is an apocalyptic number.

It is an amenable number.

193887897995401 is a deficient number, since it is larger than the sum of its proper divisors (1).

193887897995401 is an equidigital number, since it uses as much as digits as its factorization.

193887897995401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9876142080, while the sum is 88.

The spelling of 193887897995401 in words is "one hundred ninety-three trillion, eight hundred eighty-seven billion, eight hundred ninety-seven million, nine hundred ninety-five thousand, four hundred one".