139308287 has 2 divisors, whose sum is σ = 139308288. Its totient is φ = 139308286.

The previous prime is 139308277. The next prime is 139308289. The reversal of 139308287 is 782803931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139308287 - 2⁴ = 139308271 is a prime.

Together with 139308289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139308289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69654143 + 69654144.

It is an arithmetic number, because the mean of its divisors is an integer number (69654144).

Almost surely, 2^139308287 is an apocalyptic number.

139308287 is a deficient number, since it is larger than the sum of its proper divisors (1).

139308287 is an equidigital number, since it uses as much as digits as its factorization.

139308287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 139308287 is about 11802.8931622717. The cubic root of 139308287 is about 518.3928274975.

The spelling of 139308287 in words is "one hundred thirty-nine million, three hundred eight thousand, two hundred eighty-seven".