139279577 has 2 divisors, whose sum is σ = 139279578. Its totient is φ = 139279576.

The previous prime is 139279549. The next prime is 139279579. The reversal of 139279577 is 775972931.

139279577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82065481 + 57214096 = 9059^2 + 7564^2 .

It is an emirp because it is prime and its reverse (775972931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139279577 - 2⁸ = 139279321 is a prime.

Together with 139279579, 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 (139279579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69639788 + 69639789.

It is an arithmetic number, because the mean of its divisors is an integer number (69639789).

Almost surely, 2^139279577 is an apocalyptic number.

It is an amenable number.

139279577 is a deficient number, since it is larger than the sum of its proper divisors (1).

139279577 is an equidigital number, since it uses as much as digits as its factorization.

139279577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 833490, while the sum is 50.

The square root of 139279577 is about 11801.6768723771. The cubic root of 139279577 is about 518.3572132472.

The spelling of 139279577 in words is "one hundred thirty-nine million, two hundred seventy-nine thousand, five hundred seventy-seven".