138040404361 has 2 divisors, whose sum is σ = 138040404362. Its totient is φ = 138040404360.

The previous prime is 138040404287. The next prime is 138040404367. The reversal of 138040404361 is 163404040831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133257852025 + 4782552336 = 365045^2 + 69156^2 .

It is an emirp because it is prime and its reverse (163404040831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138040404361 - 2⁷ = 138040404233 is a prime.

It is a super-2 number, since 2×138040404361² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138040404367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69020202180 + 69020202181.

It is an arithmetic number, because the mean of its divisors is an integer number (69020202181).

Almost surely, 2^138040404361 is an apocalyptic number.

It is an amenable number.

138040404361 is a deficient number, since it is larger than the sum of its proper divisors (1).

138040404361 is an equidigital number, since it uses as much as digits as its factorization.

138040404361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 138040404361 in words is "one hundred thirty-eight billion, forty million, four hundred four thousand, three hundred sixty-one".