139315949 has 2 divisors, whose sum is σ = 139315950. Its totient is φ = 139315948.

The previous prime is 139315931. The next prime is 139315997. The reversal of 139315949 is 949513931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112741924 + 26574025 = 10618^2 + 5155^2 .

It is an emirp because it is prime and its reverse (949513931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139315949 - 2¹⁶ = 139250413 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 (139315919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69657974 + 69657975.

It is an arithmetic number, because the mean of its divisors is an integer number (69657975).

Almost surely, 2^139315949 is an apocalyptic number.

It is an amenable number.

139315949 is a deficient number, since it is larger than the sum of its proper divisors (1).

139315949 is an equidigital number, since it uses as much as digits as its factorization.

139315949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 44.

The square root of 139315949 is about 11803.2177392438. The cubic root of 139315949 is about 518.4023312466.

The spelling of 139315949 in words is "one hundred thirty-nine million, three hundred fifteen thousand, nine hundred forty-nine".