139315997 has 2 divisors, whose sum is σ = 139315998. Its totient is φ = 139315996.

The previous prime is 139315949. The next prime is 139316017. The reversal of 139315997 is 799513931.

139315997 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., 135047641 + 4268356 = 11621^2 + 2066^2 .

It is an emirp because it is prime and its reverse (799513931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139315997 - 2⁸ = 139315741 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139318997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69657998 + 69657999.

It is an arithmetic number, because the mean of its divisors is an integer number (69657999).

Almost surely, 2^139315997 is an apocalyptic number.

It is an amenable number.

139315997 is a deficient number, since it is larger than the sum of its proper divisors (1).

139315997 is an equidigital number, since it uses as much as digits as its factorization.

139315997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 47.

The square root of 139315997 is about 11803.2197725875. The cubic root of 139315997 is about 518.4023907835.

The spelling of 139315997 in words is "one hundred thirty-nine million, three hundred fifteen thousand, nine hundred ninety-seven".