194838725159081 has 2 divisors, whose sum is σ = 194838725159082. Its totient is φ = 194838725159080.

The previous prime is 194838725159077. The next prime is 194838725159107. The reversal of 194838725159081 is 180951527838491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192052229440681 + 2786495718400 = 13858291^2 + 1669280^2 .

It is a cyclic number.

It is not a de Polignac number, because 194838725159081 - 2² = 194838725159077 is a prime.

It is a super-2 number, since 2×194838725159081² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 194838725158996 and 194838725159014.

It is not a weakly prime, because it can be changed into another prime (194838725159681) 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, 97419362579540 + 97419362579541.

It is an arithmetic number, because the mean of its divisors is an integer number (97419362579541).

Almost surely, 2^{194838725159081} is an apocalyptic number.

It is an amenable number.

194838725159081 is a deficient number, since it is larger than the sum of its proper divisors (1).

194838725159081 is an equidigital number, since it uses as much as digits as its factorization.

194838725159081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174182400, while the sum is 71.

The spelling of 194838725159081 in words is "one hundred ninety-four trillion, eight hundred thirty-eight billion, seven hundred twenty-five million, one hundred fifty-nine thousand, eighty-one".