138056771 has 4 divisors (see below), whose sum is σ = 139397232. Its totient is φ = 136716312.

The previous prime is 138056767. The next prime is 138056773. The reversal of 138056771 is 177650831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177650831 = 547 ⋅324773.

It is a cyclic number.

It is not a de Polignac number, because 138056771 - 2² = 138056767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138056773) 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, 670076 + ... + 670281.

It is an arithmetic number, because the mean of its divisors is an integer number (34849308).

Almost surely, 2^138056771 is an apocalyptic number.

138056771 is a deficient number, since it is larger than the sum of its proper divisors (1340461).

138056771 is a wasteful number, since it uses less digits than its factorization.

138056771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340460.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 138056771 is about 11749.7562102369. The cubic root of 138056771 is about 516.8357784719.

The spelling of 138056771 in words is "one hundred thirty-eight million, fifty-six thousand, seven hundred seventy-one".