138277109 has 4 divisors (see below), whose sum is σ = 138451404. Its totient is φ = 138102816.

The previous prime is 138277049. The next prime is 138277141. The reversal of 138277109 is 901772831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901772831 = 89 ⋅10132279.

It can be written as a sum of positive squares in 2 ways, for example, as 112042225 + 26234884 = 10585^2 + 5122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138277109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138277189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85952 + ... + 87545.

It is an arithmetic number, because the mean of its divisors is an integer number (34612851).

Almost surely, 2^138277109 is an apocalyptic number.

It is an amenable number.

138277109 is a deficient number, since it is larger than the sum of its proper divisors (174295).

138277109 is an equidigital number, since it uses as much as digits as its factorization.

138277109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174294.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 138277109 is about 11759.1287517401. The cubic root of 138277109 is about 517.1105882027.

The spelling of 138277109 in words is "one hundred thirty-eight million, two hundred seventy-seven thousand, one hundred nine".