138573573409 has 2 divisors, whose sum is σ = 138573573410. Its totient is φ = 138573573408.

The previous prime is 138573573389. The next prime is 138573573431. The reversal of 138573573409 is 904375375831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102754225809 + 35819347600 = 320553^2 + 189260^2 .

It is a cyclic number.

It is not a de Polignac number, because 138573573409 - 2²¹ = 138571476257 is a prime.

It is a super-3 number, since 3×138573573409³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138573573409.

It is not a weakly prime, because it can be changed into another prime (138573573469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69286786704 + 69286786705.

It is an arithmetic number, because the mean of its divisors is an integer number (69286786705).

Almost surely, 2^138573573409 is an apocalyptic number.

It is an amenable number.

138573573409 is a deficient number, since it is larger than the sum of its proper divisors (1).

138573573409 is an equidigital number, since it uses as much as digits as its factorization.

138573573409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9525600, while the sum is 55.

The spelling of 138573573409 in words is "one hundred thirty-eight billion, five hundred seventy-three million, five hundred seventy-three thousand, four hundred nine".