139375121 has 2 divisors, whose sum is σ = 139375122. Its totient is φ = 139375120.

The previous prime is 139375079. The next prime is 139375123. The reversal of 139375121 is 121573931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113720896 + 25654225 = 10664^2 + 5065^2 .

It is an emirp because it is prime and its reverse (121573931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139375121 - 2¹⁰ = 139374097 is a prime.

Together with 139375123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139375123) 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 as a sum of consecutive naturals, namely, 69687560 + 69687561.

It is an arithmetic number, because the mean of its divisors is an integer number (69687561).

Almost surely, 2^139375121 is an apocalyptic number.

It is an amenable number.

139375121 is a deficient number, since it is larger than the sum of its proper divisors (1).

139375121 is an equidigital number, since it uses as much as digits as its factorization.

139375121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 32.

The square root of 139375121 is about 11805.7240777514. The cubic root of 139375121 is about 518.4757149501.

The spelling of 139375121 in words is "one hundred thirty-nine million, three hundred seventy-five thousand, one hundred twenty-one".