138971095 has 4 divisors (see below), whose sum is σ = 166765320. Its totient is φ = 111176872.

The previous prime is 138971093. The next prime is 138971113. The reversal of 138971095 is 590179831.

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 138971095 - 2¹ = 138971093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138971093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13897105 + ... + 13897114.

It is an arithmetic number, because the mean of its divisors is an integer number (41691330).

Almost surely, 2^138971095 is an apocalyptic number.

138971095 is a deficient number, since it is larger than the sum of its proper divisors (27794225).

138971095 is an equidigital number, since it uses as much as digits as its factorization.

138971095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27794224.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 138971095 is about 11788.6002137658. The cubic root of 138971095 is about 517.9742375743.

The spelling of 138971095 in words is "one hundred thirty-eight million, nine hundred seventy-one thousand, ninety-five".