870256139 has 2 divisors, whose sum is σ = 870256140. Its totient is φ = 870256138.

The previous prime is 870256117. The next prime is 870256147. The reversal of 870256139 is 931652078.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 870256139 - 2¹² = 870252043 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 870256096 and 870256105.

It is not a weakly prime, because it can be changed into another prime (870256199) 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, 435128069 + 435128070.

It is an arithmetic number, because the mean of its divisors is an integer number (435128070).

Almost surely, 2^870256139 is an apocalyptic number.

870256139 is a deficient number, since it is larger than the sum of its proper divisors (1).

870256139 is an equidigital number, since it uses as much as digits as its factorization.

870256139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 870256139 is about 29500.1040506640. The cubic root of 870256139 is about 954.7339477987.

The spelling of 870256139 in words is "eight hundred seventy million, two hundred fifty-six thousand, one hundred thirty-nine".