138146221439 has 2 divisors, whose sum is σ = 138146221440. Its totient is φ = 138146221438.

The previous prime is 138146221399. The next prime is 138146221441. The reversal of 138146221439 is 934122641831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138146221439 - 2⁸ = 138146221183 is a prime.

It is a super-3 number, since 3×138146221439³ (a number of 34 digits) contains 333 as substring.

Together with 138146221441, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138146221439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138146221469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69073110719 + 69073110720.

It is an arithmetic number, because the mean of its divisors is an integer number (69073110720).

Almost surely, 2^138146221439 is an apocalyptic number.

138146221439 is a deficient number, since it is larger than the sum of its proper divisors (1).

138146221439 is an equidigital number, since it uses as much as digits as its factorization.

138146221439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The spelling of 138146221439 in words is "one hundred thirty-eight billion, one hundred forty-six million, two hundred twenty-one thousand, four hundred thirty-nine".