138883781898181 has 2 divisors, whose sum is σ = 138883781898182. Its totient is φ = 138883781898180.

The previous prime is 138883781898131. The next prime is 138883781898193. The reversal of 138883781898181 is 181898187388831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114052446457156 + 24831335441025 = 10679534^2 + 4983105^2 .

It is a cyclic number.

It is not a de Polignac number, because 138883781898181 - 2³¹ = 138881634414533 is a prime.

It is a super-2 number, since 2×138883781898181² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138883781898095 and 138883781898104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138883781898131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69441890949090 + 69441890949091.

It is an arithmetic number, because the mean of its divisors is an integer number (69441890949091).

Almost surely, 2^{138883781898181} is an apocalyptic number.

It is an amenable number.

138883781898181 is a deficient number, since it is larger than the sum of its proper divisors (1).

138883781898181 is an equidigital number, since it uses as much as digits as its factorization.

138883781898181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1189085184, while the sum is 82.

The spelling of 138883781898181 in words is "one hundred thirty-eight trillion, eight hundred eighty-three billion, seven hundred eighty-one million, eight hundred ninety-eight thousand, one hundred eighty-one".