138259089581 has 2 divisors, whose sum is σ = 138259089582. Its totient is φ = 138259089580.

The previous prime is 138259089547. The next prime is 138259089593. The reversal of 138259089581 is 185980952831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131359129225 + 6899960356 = 362435^2 + 83066^2 .

It is an emirp because it is prime and its reverse (185980952831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138259089581 - 2¹⁸ = 138258827437 is a prime.

It is a super-2 number, since 2×138259089581² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138259089581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138259089481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69129544790 + 69129544791.

It is an arithmetic number, because the mean of its divisors is an integer number (69129544791).

Almost surely, 2^138259089581 is an apocalyptic number.

It is an amenable number.

138259089581 is a deficient number, since it is larger than the sum of its proper divisors (1).

138259089581 is an equidigital number, since it uses as much as digits as its factorization.

138259089581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 59.

The spelling of 138259089581 in words is "one hundred thirty-eight billion, two hundred fifty-nine million, eighty-nine thousand, five hundred eighty-one".