655608139 has 2 divisors, whose sum is σ = 655608140. Its totient is φ = 655608138.

The previous prime is 655608137. The next prime is 655608197. The reversal of 655608139 is 931806556.

655608139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655608139 - 2¹ = 655608137 is a prime.

Together with 655608137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 655608095 and 655608104.

It is not a weakly prime, because it can be changed into another prime (655608137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327804069 + 327804070.

It is an arithmetic number, because the mean of its divisors is an integer number (327804070).

Almost surely, 2^655608139 is an apocalyptic number.

655608139 is a deficient number, since it is larger than the sum of its proper divisors (1).

655608139 is an equidigital number, since it uses as much as digits as its factorization.

655608139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 655608139 is about 25604.8460061763. The cubic root of 655608139 is about 868.7232512234.

The spelling of 655608139 in words is "six hundred fifty-five million, six hundred eight thousand, one hundred thirty-nine".