255556139 has 2 divisors, whose sum is σ = 255556140. Its totient is φ = 255556138.

The previous prime is 255556129. The next prime is 255556177. The reversal of 255556139 is 931655552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255556139 - 2⁴ = 255556123 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 255556096 and 255556105.

It is not a weakly prime, because it can be changed into another prime (255556129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127778069 + 127778070.

It is an arithmetic number, because the mean of its divisors is an integer number (127778070).

Almost surely, 2^255556139 is an apocalyptic number.

255556139 is a deficient number, since it is larger than the sum of its proper divisors (1).

255556139 is an equidigital number, since it uses as much as digits as its factorization.

255556139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 202500, while the sum is 41.

The square root of 255556139 is about 15986.1233261851. The cubic root of 255556139 is about 634.5932369217.

The spelling of 255556139 in words is "two hundred fifty-five million, five hundred fifty-six thousand, one hundred thirty-nine".