870820513 has 2 divisors, whose sum is σ = 870820514. Its totient is φ = 870820512.

The previous prime is 870820499. The next prime is 870820523. The reversal of 870820513 is 315028078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670654609 + 200165904 = 25897^2 + 14148^2 .

It is a cyclic number.

It is not a de Polignac number, because 870820513 - 2⁵ = 870820481 is a prime.

It is not a weakly prime, because it can be changed into another prime (870820523) 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, 435410256 + 435410257.

It is an arithmetic number, because the mean of its divisors is an integer number (435410257).

Almost surely, 2^870820513 is an apocalyptic number.

It is an amenable number.

870820513 is a deficient number, since it is larger than the sum of its proper divisors (1).

870820513 is an equidigital number, since it uses as much as digits as its factorization.

870820513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 870820513 is about 29509.6681275815. The cubic root of 870820513 is about 954.9402895701.

The spelling of 870820513 in words is "eight hundred seventy million, eight hundred twenty thousand, five hundred thirteen".