138561127 has 4 divisors (see below), whose sum is σ = 139832440. Its totient is φ = 137289816.

The previous prime is 138561121. The next prime is 138561149. The reversal of 138561127 is 721165831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138561127 - 2¹¹ = 138559079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138561092 and 138561101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138561121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635493 + ... + 635710.

It is an arithmetic number, because the mean of its divisors is an integer number (34958110).

Almost surely, 2^138561127 is an apocalyptic number.

138561127 is a deficient number, since it is larger than the sum of its proper divisors (1271313).

138561127 is a wasteful number, since it uses less digits than its factorization.

138561127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271312.

The product of its digits is 10080, while the sum is 34.

The square root of 138561127 is about 11771.1990468261. The cubic root of 138561127 is about 517.4643904955.

The spelling of 138561127 in words is "one hundred thirty-eight million, five hundred sixty-one thousand, one hundred twenty-seven".