870820523 has 2 divisors, whose sum is σ = 870820524. Its totient is φ = 870820522.

The previous prime is 870820513. The next prime is 870820541. The reversal of 870820523 is 325028078.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 870820523 - 2⁶ = 870820459 is a prime.

It is not a weakly prime, because it can be changed into another prime (870820513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435410261 + 435410262.

It is an arithmetic number, because the mean of its divisors is an integer number (435410262).

Almost surely, 2^870820523 is an apocalyptic number.

870820523 is a deficient number, since it is larger than the sum of its proper divisors (1).

870820523 is an equidigital number, since it uses as much as digits as its factorization.

870820523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 870820523 is about 29509.6682970175. The cubic root of 870820523 is about 954.9402932254.

The spelling of 870820523 in words is "eight hundred seventy million, eight hundred twenty thousand, five hundred twenty-three".